The apartment was very nice and cosy. There were four of us staying and we had plenty of space. I tend to beleive that six people would be a bit too much for the free space ie living room and dining room (sleeping space is fine).
What we apreciated most was the heating that was on all the time as we visited during heavy winter (and snow). Nevertheless the hot water was not always that boiling, and it sometimes kept a bit unstable (hot-cold-hot-cold), but I beleive that was due to the boiler.
The location was very good, just a few minutes walk uphill to Taksim square and a few minutes walk downhill to the sea.It would not be a good idea though for someone with difficulty to walk to stay in this apartment as the walk there is quite steep at points, unless if they can drive of course. Otherwise, even if one does not want to go uphill they can go down to the sea, use the tram to go to sites and then from the tram station (last one on the line) use the tube to take him to taksim square and walk downhill to the apartmanet!
All in all a very nice apartment, good location (also there is a mini market just across the apartment open all day long and it has EVERYTHING one can need), safe, clean and quiet.