Deniz and Marco have a gem of a location. It has the most wonderful view and it's in a very lovely neighborhood. Everything is walkable. within ten minutes is the nearest metro, the Dolmabahce palace and Galata tower are only 15 minutes away and there's a plentiful amount of bars, cafes, and restaurants nearby.
The apartment itself is very comfortable with an incredible balcony. Be aware it's up a few flights of narrow stairs but it's not a huge issue.
The location itself is on the top of a hill so be prepared for some uphill walks (but with wonderful views).