The host is very nice and quickly responsive. The flat has everything you need.
However the flat smells too smoky. We've got the flat on -1 level, which seems to be a cellar in the past, so at the kitchen you can smell dampness. The district is very good, a lot of restaurant and Taksim place just nearby, but the street is awful. There is very bad sound proofing, so you can hear everything happening on the neighbour floors.
Some of the equipment is broken (e.g. faucet in the bathroom and at the kitchen).
In general, you can find better flat for the same price in Istanbul.