Clean and convenient tiny room with ensuite bathroom.
Pros: Good matress, sheets and towels as well as kettle and basics for a quick breakfast. Laminated maps and tips were also thoughtful and useful. Another very professional feature was a telecom to various parts of their house in case you wanted to communicate with them (which we only used once to ask about adaptors). Also, there was hand soap in the bathroom (not always the case elsewhere).
Cons: No way of darkening the room to get some sleep (as seen on the cover picture, there are three beautiful squares/shelves that can't be covered, which can be a great source of light for the sleeper who does not get bothered by light), one can hear the family from the adjacent room (possibly laundry/kitchen?) making it not quite a very "private" exprience. Also, there are two cars parked facing downhill where you'll sleep, making it hard to move into or outside the property easily (there is a gate that leads to the family's front door, which we did not feel comfortable using in case it was not appropriate or intrusive). There is hardly any room to move, sit somewhere or write anything on a surface. You walk in, place your suitcase on the floor and then either have to sit on the bed or be in the bathroom. Also, a long walk from and to tube stations (make sure to use Finchley Road tube by bus and not Hampstead on foot!). Lastly, I found this property better suited for someone who absolutely must be in Hampstead and not for someone visiting central London for a few days.