My place is located at heart of Istanbul 5min. to Taksim square by walking, you can reach every public transportation in 5 min. (ferryboats to cross Asian side or islands, tram to go old town, metro to going shopping malls)
my neighbors are really cool people you can knock their door also to ask anything, we are three close friends and same apt. And as an Istanbul expert I would love to tell you my best places that you should eat, visit and to do list.