The location of the flat is amazing. Only about 10 minutes until the St. Pancras station which offers connections to 5 or 6 underground stations, the national rail as well as bus stations. A tesco express is about 10 minutes far. Kings Cross itself is really beautiful and offers a small open air cinema (screen on the canal) during summer.
The flat itself was okay. The room was clean and tidy, but the kitchen and the kitchenware were only half clean. Due to the shared kitchen, it relies on the guests to keep it clean and everybody has a different opinion on what clean means. Same applies for the bathroom.
If you only stay for a couple of days, this will most likely not bother you so much. Mostly also because you will leave the room in the morning and return late in the evening in a big city like London where you spend most of your time on the go.
It was enough for that. Nice neighbourhood.