Very interesting place to stay in Istanbul for a couple of days.
Pros:
+ Very spacious flat in stylish vintage furnishing
+ 3 (!) bathrooms
+ Big Migros supermarket just a 5 minutes by foot
+ Close to Besiktas cafe and restaurant area
+ Cosy terrace with BBQ, 2nd dining table and nice view to the town
+ Kitchen is equipped with a huge amount of dishes, glasses, pans, pots, spices - everything you need
+ Dishwashing machine is a big plus
+ Powerful boiler provides enough hot water for heating and shower even at winter time
Cons:
- You should expect some problems with parking places
- The flat is a bit far from main public thansport lines
So this place seems a good choice for a company or a several couples.