Can I make this garage (in a block) usable?

I have just started getting back into training. I've just done my first triathlon - a Sprint distance one. I am not a strong cyclist but really keen on doing turbo training.
I don't want to turbo train in our flat - we have just had new carpets put in everywhere, with a view to selling it in the new year.
A friend suggested the kitchen but I am worried about the noise for downstairs and next door. Additionally, it's also a real hassle having a bike in there, and the only place to store it if I wanted it out is the garage (shown below).
The garage is in a block. It is dark, dingy, the roof leaks at the side too. There is no power and also no lighting.
I am planning on clearing it out this weekend as much as I can. I have seen online that you can get battery powered (re-chargable through mains) fans. So I could buy one of those.
Do you think this would just be too unpleasant a place to train? I feel a bit self-concious being stuck in a garage by myself, with no lights, maybe people walking past, etc. Would it even be worth it?

I don't want to turbo train in our flat - we have just had new carpets put in everywhere, with a view to selling it in the new year.
A friend suggested the kitchen but I am worried about the noise for downstairs and next door. Additionally, it's also a real hassle having a bike in there, and the only place to store it if I wanted it out is the garage (shown below).
The garage is in a block. It is dark, dingy, the roof leaks at the side too. There is no power and also no lighting.
I am planning on clearing it out this weekend as much as I can. I have seen online that you can get battery powered (re-chargable through mains) fans. So I could buy one of those.
Do you think this would just be too unpleasant a place to train? I feel a bit self-concious being stuck in a garage by myself, with no lights, maybe people walking past, etc. Would it even be worth it?

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I can run my laptop easily enough. I'd only be training for maybe 30-90 minutes max maybe.
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https://www.makitauk.com/products/portable-fan
https://www.makitauk.com/products/job-site-radios
https://www.amazon.co.uk/Makita-DML805-Corded-Cordless-Light/dp/B010SV3OOO
Other makes are available obvs
Power Inverter
Solar panel
That'll be enough to run a fan and a light for a while.
You could probably get away with that rechargeable fan and a solar light
A steady 75W would power a decent fan.
Pretty sure the bikes (wahoo, tacx and stages) have USB outputs (iirc)
I may look into a portable fan but it would drown out the podcasts I have playing from a Bluetooth portable speaker.
If you've got the door open and people are walking past just put a bucket outside and say you're doing a charity ride but you're having to do it on a turbo because of covid
Re a generator - never used one but would it not build up fumes?
So yeah, don’t bother with that. Great idea, just not done brilliantly well
I'm lucky in that my in-law is qualified electrician amongst other things. I've got armoured cable running from conservatory on its own circuit to shed with its own rcd fuse box,
Our last house was harder as detached garage at end going over neighboring property and too far to make armoured cable impractical and would require going overhead, was using it for other purposes, when I brewed beer so had a propane setup to start and moved before fully establishing the brewery
I currently don't have a fan (biggish desk one I had broke) and I turbo in a garage with the up and over door open - sometimes fully open, sometime 80% open with a piece of wood propping it up. Never bothered by people walking/driving past seeing a weird bloke in bib shorts and no top riding a stationary bike in the dark.
I've a towel draped over my bars and whilst I get sweaty I don't feel it's compromising my performance during my sessions of 20 - 60 minutes or so. I've been regularly turboing right through the lockdown period when it was pretty warm at times and have also done so when it's been seriously snowy and unsafe on the roads too,
Once I have my laptop up and running I generally don't feel a need for additional light so in your situation I'd be fairly happy with no mains power and some sort of light source for fumbling about in the dark.
Rechargeable lights and cooling fans are available, eg
Light:
https://www.toolstation.com/luceco-rechargeable-led-work-light-ip65/p80137
Fan:
https://www.amazon.co.uk/EasyAcc-Operated-Personal-Wireless-Electric-8-inch-USB-Fan-Built-5200mah-Battery/dp/B07PGRGD5X/ref=sr_1_8?dchild=1&keywords=rechargeable+fan&qid=1601929035&sr=8-8
I think the whisper drive was one of their first models and the self powered idea is great but it doesn't seem to have been retained on the newer ones.