I heartily recommend Ali's place for your visit, either short or long term. The two room apartment is fully equipped and, more importantly, everything works perfectly (quick hot water and many radiators!). The space is big and nicely decorated. It's cozy and super comfortable.
The location is great: the nearest tube station (Northern Line) is a 6 minute walk away but there are a lot of convenient bus stops that are very close (there are many routes that can get you into central London in less than 15 minutes). There's a big supermarket 4 minutes away and an Overground station crossing the street. The market and everything lively about Camden Town are a short walk away, too. Cafes and restaurants basically outside the door.
Regarding past reviews on this listing: Ali has now put a table next to the kitchenette. Also, you can hear the Overground trains but they really were not bothersome to me. Either way, after a while you don't even notice them.
As for Ali, he is a wonderful host that has made me feel at home in the apartment and in London. He's a cheery person that is eager to help and super friendly. Communication was quick and easy.
You make no mistake booking your stay with him, I assure you!