Serdar is an excellent, well-organized host. The check-in was super easy.
The apartment is close to several cool neighborhoods. Lots of great coffee places and restaurants and a short walk to the water.
The wifi was pretty steady. In the week that I was there, I only had a challenge a few times - mostly while watching streaming services.
The stairs in the building are quite narrow - which is common in Istanbul. This can be a challenge if you've got mobility issues. Be clear what your needs are with the host - Serdar will be honest and responsive.