I stayed for 5 nights in David's flat while i studied at Imperial College beside St Marys Hospital.
I am a female, travelled alone, and the stay was very comfortable , a nice size flat with everything you would need, very comfortable bed, lots of heating and hot water, lovely courtyard space to sit and eat or have a drink!
The area is very quite and close to all amenities. there is a steep staircase to get to the entrance as it is a basement flat but otherwise no physical reason why it would not suit most travellers.
David is a gentleman, a clever polite interesting person, I enjoyed all our chats!!
I had an uneventful week but I would easily guess if you ran into any problems while staying in London David would be able or find a way to help you out!
I highly recommend using his Air bnb for a trip to London.