My stay was generally good. The flat is very well located (5-10 minutes walking distance from King's Cross station), a lot of restaurants and supermarkets around, it is comfortable, the Internet is very good and the kitchen has everything you need for everyday use.
However, there were a few little details that would need improvement: the mattress seemed a little old and had a "hole" in it, there were fruit flies in the flat all the time (but maybe because it was the summer and I kept the windows open), and the wardrobe in the bedroom was already full of towels and sheets, there was no room to store my luggage.