Great apartment to stay and excellent location for a lot of the main touristic sites. Barbaros was a great host and very helpful going above and beyond. I wanted to buy some Istanbulkarts for public transport but was struggling to find them in the city, Barbaros not only sold the cards for 15 TL each (only 2 TL more than the official price on the ticket machines), he then also took the time to help link up the cards with our HES codes which was very helpful.
The only points I'd mention is that there is wooden flooring and the sound insulation is not the best, so you can hear the people upstairs talking and their footsteps. In addition, the flooring tiles in the bathroom around the shower were broken so there would be a lot of loose debris when showering - otherwise the actual bathroom and shower were fine.
Overall very good value for money and a great stay.