We stayed at Roberto and Agata's place this February for 10 days. The place is very nice and clean, and it has a separate bathroom - which was very convenient. The location is also nice - there are two underground stations nearby and the Upper street with a number of good restaurants and cafes is within the walking distance. If you decide to take a bus from the centre of London, it will take you up to 30 mins (longer than the underground but totally recommended!). If you are a keen walker, you can walk to King's Cross in 25 mins. There are also many guidebooks and maps in the room.
Roberto and Agata are very welcoming hosts and very friendly people. They were very helpful when we wanted an advice on where to go or places to visit during our stay.
We enjoyed our stay!