Guner was very helpful and welcoming. The flat is basic but very comfortable for two people and has everything you need. (A coffee maker would be perfect, though!)
In terms of location, it is very close to the main shopping street Istiklal and easy to get everywhere, however, the actual area where the flat is located it not very nice. It's very dark and you have to walk under a dodgy bridge to get in and out of the street. We tried other routes, but they weren't better - pitch dark and even scary at night.