This place is decent. We arrived late at night, so we took the taxi from taksim square to the apartment (~15mins) and it was 75 lira.... I strongly suggest that you metro or take the bus here. Taxi fares are outrageous.
The apartment itself is pretty clean, but rather small and very hot, probably because it was close to the top floor.
The host is very hospitable, unfortunately we didn’t get to stay that long. The location is pretty central, walkable to the lot of places. If you’re just looking for a place to rest at night & will be out for most of the day, I’d recommend here. But if you’ll be home a lot, then maybe you’ll want a bigger place.