Cute little place in an excellent area. It's beautifully decorated and the terrace is huge and great to enjoy on a sunny morning with coffee.
A couple of things to be mindful of, the stairs are exactly as in the picture, so lots of large luggage or mobility issues will be a struggle. Secondly, the WiFi is not strong so it isn't idea if you need to work or make calls there. Third, there is an art studio below and sometimes the smell of varnish and chemicals is very very strong so if you are sensitive to smells it might not be the place for you.
Worthwhile as a good value spot just steps away from Galata Tower. Host was responsive and check in was simple.