A place I can only strongly recommend for couples or globetrotter on tiny budget who don't know London yet! Indeed, the King's Cross subway & train station (2 min away by foot) will get you to the most known London places in 15 min max.
The room might be a bit small but you have there everything you need for a small week or few days stay. Besides, you have a Tesco Express (opened everyday except on Sunday) 500 meters away from the place (https://goo.gl/maps/NnymL6u6vNx), where you can get fresh fruits, salads, water and else. There is a lot of traffic and emergency services passing by so plan ear plugs if you cannot sleep in noisy surroundings.
The host is very discreet but will definitely help you in whatever you need; whether for sightseeing tips or the place itself.
In our concern, it was very warm so if you stay in London during summer so definitely ask for a fan.
Great place!