Tessa&John are Great and nice hosts, always available if you need.
The apartment is absolutely nice, with everything you need for a great stay.
Close to the northern line underground stops Kentish Town, 4 stops from King's Cross.
In the area there is many supermarket, like Tesco, Sainsbury's, Lidl and local market.
Kentish Town is a quite and clean area, 10 minites walking from the o2 kentish town arena, 12/15 minutes from camden town.
I do really recommend this apartment!