I stayed at Bonn's place for two weeks. While the apartment is centrally located and in a modern building, I hesitate to recommend this place.
From the beginning, the communication with the host was extremely slow and with no regard to the guest. Weeks before my stay, I emailed and asked to shortened my stay. I never got a response. I only got a response after I emailed a week later asking to leave it as is. I was then given the address to the apartment, but with no apartment number.
The day of my arrival, there was no check-in from the host. I arrived and figured out the apartment number by looking under door mats for a key. I had sent host a message when I got there and only got a response four hours later. During this time, I also had to message him to give me the wifi password(wifi was not stable at all), pass me his number, inquire about the TV in the bedroom(there is not cable TV and it does not connect to wifi so was not usable), and inform him that the toilet flush in the upstairs bathroom was visible broken. Unfortunately I had not noticed and used It(I had to ask him to send someone immediately to repair and had to keep door closed as a result). I also realized that the main living space is not air conditioned, only the upstairs/bedroom. I ended up staying upstairs whenever I was home. Note also that the AC upstairs is not super strong. I found a fan downstairs which I used to help circulate the air upstairs. I would definitely no recommend this apt for the summer months.
At the tail end of my stay, the power went off in the building. I texted the host and they responded that it happens in Istanbul. I totally understand as I've traveled quite a bit. I noticed buildings around had power but luckily it came back by the end of the day. A few days later, the power goes out again. I leave the apartment assuming it will be back by the end of the day. When I get back, there are men working on the building and have turned the power off. The sun is setting so I text the host and tell him what's happening. I let him know that the men say it will be back on but Im not sure since they speak no English. He says good luck with that. I expected him to ask to speak to them or ask to call them. I send him a pic of the work they are doing and inform him that I'm worried it won't be back on and I won't be able to get in since the keypad lock to the building won't work. At this point he stops responding and text me three hours later to tell me his phone was off. This was upsetting as he was literally chatting on text and suddenly goes silent. This was two days before my departure and I never responded back to him. He also never messaged me to ask about my stay or to check me out.
For all these reasons, I would hesitate to recommend this to travelers and just hope this review helps improve the stay/communication for other guests.