I booked this apartment for my fiance and his mom. Serdar was very nice and responsive. The apartment is very clean and convenient, he was also very helpful and pleasant to talk to.
The apartment is in a very central location… it’s in the ground floor so you don’t need to climb the stairs but the building entrance has about 7 steps (inaccurate as I’m counting from memory) so if you have mobility issues then you need to be aware.
The street is quiet despite it being just a few mins walk to Taksim but also if anyone has a mobility issue, please be aware that you’d need to walk up a steep slope to Taksim (not the street itself but in the end if the street)
Other than that, the apartment and Serdar are a perfect option in Istanbul