We were two to spend 5 days in Daniel's room.
The house is located in a safe, residential area of London, just a 5 minutes walk to the South Hampstead tube station, or a 10 min walk from the Swiss Cottage tube station; the area is very well connected to the city center, and has some shops around (supermarkets, restaurants etc).
The house itself was well equiped, the room and bed were comfortable. We shared the bathroom and kitchen with other travelers, so the cleanliness and noise level in the house will depend on how respectful the others are (it went overall fine for us!).
Also, Daniel was a great host! Communication with him before, during and after our trip was easy, the check-in and check-out procedures went very smoothly, and he had some useful advice for us.
We would definitely recommend staying at Daniel's place!