Our experience was overall very good.
HOST is organized and provides assistance in any situation
we had a small issue with hot water and somebody was promptly send to verify
we needed to organize minor issues and all was promptly addressed
As usual in these sitution , internet/roaming minutes on your phone are mandatory to achieve a min level of communication as assistance is provided mainly online (cellphone, chat, etc).
the HOUSE is spacious. As described by host
In wintertime it was warm ; accessible through stairs with a fully equipped kitchen that we used.
Apartment is clean , yet I would say fixed in a rush to be rented out as it is lacking some minor yet usefull amenities (hangers for towels , some more chairs , a larger table that allows all occupants to use it at once , some hanging/surface support for own personal items in rooms, etc)

POSITION : depends on what you like;it is in the center of Galata in touristy spot.if you are looking for that it is good.