Hakim's place is exactly as it looks in the photos, super clean, everything you need is available and the wifi works great. The stairs are a little bit steep but if you're not planning on bringing 4 huge suitcases (our fault :p) then it shouldn't be a problem.
Hakim is really nice, He let us check in quite late and helped us find the flat which was super easy from the Taksim square, a couple of minutes walk not more. He checked in on us when we arrived and asked if we needed anything everyday. He is super responsive, whenever we contacted him he answered right away.
The best part about the place is the location, it's not even a one minute walk to İstiklal street which is the hub of Istanbul where restaurants, cafés, shops ..etc are.
I definitely recommend the place and I sure am booking it for my next stay in Istanbul.