The place indeed is near the main attractions of Istambul's old city (Grand Bazaar, Hagia Sophia, Blue Mosque); also, it's in 10 minutes from HVIST-14 stop (Beyazıt) - the most convenient way to get to the IST airport. There's the doorman so that you can have late check-in / early check-out. The apartment corresponds to the photos. The apartment is on the sunny side of the building, so it gets a bit hot during the day, but the air conditioning helps. It can be quite noisy at night, so bring earplugs.