A very pleasant stay in the center. Close to Istiklal, but not noisy (maybe a couple cars passing by). Easy access to metro, many sights close by. Lots of little cafés to have breakfast.
The apartment is slightly smaller than we thought, but it wasn´t a problem. We were 3 people, sleeping on the couch was comfortable enough. The bathroom door is fully glass! Make sure the people you travel with are comfortable with that :)
The kitchen is fully equipped, everything is very cute and in in a perfect working order. Very clean! And a really cozy space in general.