This was my 5th visit to Istanbul and my 4th Istanbul Airbnb stay. The location is indeed amazing. The best in Istanbul in my view. The apartment is nice and new, with a big, spacious terrace. The main bathroom is very nice and spacious as well. However, we experienced some issues that I have not experienced ever before despite always staying in Galata area.
(1) The apartment is surrounded by music shops. One is right underneath the apartment. Might not be ideal for light sleepers. However, the noise was only present until about midnight (but on a daily occasion).
(2) As the apartment is two-storey might be not ideal for people who do not like to go back and forth between different levels.
(3) There is a toilet right outside the apartment door (presumably belonging to a shop downstairs). Sometimes you could smell it in the apartment.
(4) Our check in and check out were a bit confusing (as the host was not present). We also never were offered a breakfast (as advertised). But we also never asked about it as simply did not know it was available. Previously I had a better communication with Istanbul Airbnb hosts.