Our stay at Enes flat was really great, the best thing about the apartment is it’s location - everything you need is available in a walking distance of 2 minibuses. The area is really lively, there are the nicest restaurants in Istanbul as we found.
The advantage of the cellar location is that it’s quiet at nighttime, but you should be comfortable with not having much daylight.
Another plus is that there were things like a bottle of water, soap, even ear tips that we were able to use.