My 1+1 flat is located in the heart of Istanbul, so it is really easy to travel all around Istanbul and also very safe. There is one bedroom, a living room, kitchen and bathroom as well as a balcony. I have a double bed in the bedroom and a folding couch in the living room, so 4 people can comfortably sleep.
The guest/s can find everything they need in the flat, even the movies, English books, magazines in the living room, full equipments in the kitchen, so you can cook if you want, hot water 24 hours, very comfortable ortopedic double bed in the bedroom, and huge balcony if you want to enjoy the sun or chill out at night.
You can find nice, cosy and cheap restaurants, and shops near by and there is an amazing park and centre of Besiktas, as well as all the public transports in the walking distance. Even if you want to take a taxi, it will not cost more than 10 TL from/to Taksim