This is my second stay at Ivan's place and I think it might be my favourite AirBnb that I've stayed in London so far. Very close to both St. Pancras station and the British Library (I was staying here to carry out research). It's also a short walk from the flat to Mornington Crescent in case you need a different line.
The flat is lovely and clean and the host is very helpful, friendly and polite.