The apartment was really good, also for a longer stay (I stayed for a month). The room is not huge but large enough. If you want to cook, the basic equipment is there. What I really enjoyed was that the room is bright and the table is at a large window with a nice view on trees. It is also very calm so it's no problem to keep the window open during the night.
Location-wise, the apartment is fine as well, it takes a walk of 15 minutes (5 minutes if you take the bus) to get to East Finchley station and then 20 more minutes for getting to the city centre. However, if you just want to do groceries or you are looking for a nice restaurant or pub, you find everything in Finchley itself. And if you want to relax in the nature, it is just a walk of 5-10 minutes to get to the Coldfall Wood.