Pros:
-view of the water from the bedroom & living area
-close to tram/bus lines to Sultanahmet (7 min walk) & ferry station to Kadiköy/Üsküdar/Princes Islands (15 min walk)
-close to grocery stores & restaurants/bakeries & dog park
-very clean
-comfortable bed & variety of pillows so you will probably find one that is comfortable to you
-comfortable sofa bed
-AC in the living area (open kitchen/dining/TV area)
-smart TV
-modern small flat (pro if you like tiny homes like me!)
Cons:
-on the side of a very steep hill (steep uphill to Taksim/Istiklal street & steep downhill to the main road to catch public transportation)
-no elevator (the flat is on the third floor, so you have to go up/down two flights of stairs every time)
-the AC is only in the living area & there's only one window in the bedroom (I get hot while sleeping, so I ended up sleeping on the very comfortable sofa bed instead)
Recommendations:
-if you're going to wash clothes, plan to wash clothes frequently when you get back at night & hang dry on the provided drying rack (the rack only has 7 rungs, so do small loads that can fit on the rack). If you're experienced with washer/dryer combos maybe you would be able to figure out how to dry your clothes with the dryer, but I prefer to hang dry my clothes.
-Craftsmen Park (very close) has a great view of Sultanahmet
-Fındıklı Parkı has breakfast/fish cafe right on the water
-order honey & cream at Van Kahvaltı Evi
-use the Moovit app to navigate public transportation all over the city
-take the public ferry from Kabataş to Anadolu Kavağı (you'll have to do one transfer, but there are multiple ways to get there) for a very cheap Bosphorus tour & walk up to Yoros Castle to get a view of the connection between the Bosphorus & the Black Sea
-take the public ferry from Kabataş to Adalar (the largest of the Princes Islands), rent a bike & explore the whole island in one day, or take the electric bus
-the Internet is full of recommendations for other parts of Istanbul, but I just wanted to share a few less common recommendations from my time