This would not be a bad place if maintained — the location is decent, it’s reasonably quiet, and there is an elevator which was a major pro for me, they are a rarity in Istanbul and I had large bags to wrestle with.
Unfortunately, the place was not clean; the rug on the living room floor had more hair on it than a yak, the couch, towels, and sheets had stains, and worst of all, the bathroom had a terrible sewer smell that made me want to throw up every time I went there. It really looked like the place hasn’t been maintained at all beyond just doing a quick wash for the sheets and towels. This seems to be the norm in Istanbul, where a company owns a building and cares little for the quality.
Check-in was also bad — my mobile internet did not work and the host didn’t provide a wifi pass in the listing, so I was stuck with no internet until I went to a cafe. I left after one night and thankfully was able to find a nicer place. Absolutely not recommended.