NO WI-FI!
I put that at the top of the review to maybe warn somebody like me - I didn't notice the fact that there is no wifi in amenities because I wasn't checking for it :-) It's pretty unexpected not to have internet in an AirBnB in central London....
That being said, this is a small, but nice apartment that is amazingly well-located. The closest subway is Central line, but Paddington is also close (so 30 min to/from Heathrow is possible!)
About the size - it feels like a hotel room, but for the price it's actually bigger than what you could get in local hotels.
Two more issues:
- Paper-thin walls: ear plugs are recommended (the neighbor sometimes watched TV at 4am)
- Point the shower head away from yourself when "activating" the shower heater: the first 2 seconds of water are scalding hot and I managed to burn myself
Other pros: elevator, comfy bed, nice and responsive host (offered to cancel my stay earlier due to lack of wi-fi - but I ended up staying), warm.