We enjoyed our stay in this apartment however I would say it's more suitable for shorter stays than longer ones.
we stayed for almost two weeks and while the apartment is nice and spacious for a couple, the kitchen is quite small and doesn't really have the right equipment to cook anything other than small and very basic meals.
the area is quite close to the major tourist attractions in Istanbul and close to the metro and marmaray station, there are a lot of shops and restaurants nearby so the area is quite noisy and stressful. I must say that although the apartment is quite sound proof you can still hear some of the constant beeping from the cars outside.
the bathroom was lacking in some amenities, there was only one toilet roll left, no shower soap or gel and just a little shampoo.
in regards to communication with the host I have no complaints, he always answered very quickly and clearly. the check in process was quite easy too. my only complaint would be that we asked the host for a bigger pan for cooking and something to hang our clothes and he didn't provide it.