Mehmet is a very polite and helpful host. He will do everything he can to assist during your stay.
I stayed in the apartment for a month. Here are the pros and cons:
Pros:
1. Location - 10 minute walk to the Marmaray metro station which gets you into the old town area with the main tourist sights in 15 minutes. Bakirkoy is also a very local area with few tourists and there are plenty of restaurants, supermarkets and 2 shopping malls nearby.
2. Apartment is quiet on a one way street and the bedroom faces a quiet courtyard.
3. Apartment is spacious and well-furnished. Kitchen is well equipped.
Cons:
1. WiFi speed is around 10Mbps download and less than 2Mbps upload. Mehmet assisted us with a sim card with data which my wife used as a hotspot for teaching online.
2. The shower - need to run the tap on full hot for about 20 seconds to get the water hot. You then change to shower mode and adjust the temperature but the water gets cold after a few minutes so you need to turn off the water and start the process again.
3. It is an old building so the sound proofing is not good. You can hear your neighbours and they can hear you.
Despite the cons we had a pleasant stay and Mehmet was very accommodating.