First, the positives:
Omer and the rest of the staff were welcoming and warm. The front of the building was attended 24 hours/ day, so there were no issues with check in or check out. The location, right next to the Galata Tower, made getting around town very easy (close proximity to the Sishane Metro, for to and from the airport, and Karakoy Tram stop, for access to Sultanahmet etc and the ferries to the Europeans side. Walkable to Taksim).

Now for the negatives:
It was much more of a hotel or apartment building than a typical AirBnB. Thin walls meant hearing other guests come in late, or wake up early.
Most importantly, it was pretty unclean. The shower had lots of mold. The oven still had a bunch of food left from the last guest (peas stood out). The couch was stained. The walls were all covered in scuffs.
However, the bed seemed to be clean, or else we would have been out of there.