The location is great -- literally around the corner from the Galata Tower but quiet at night, which was lovely considering there are so many restaurants and quirky clothing shops in the area and it's always buzzing.
There are plenty of places to eat just a few steps away from the apartment (don't spend a huge amount of money at the restaurants around the tower when others nearby are much cheaper and better).
It's also close to Istiklal, the big shopping street. Wear comfortable shoes though! The cobblestones and hills can be punishing if you're not wearing good shoes.
We were about 30 minutes walk away from the Grand Bazaar, Hagia Sofia and Blue Mosque but if you walk across the Galata bridge you can amble through the Egyptian Spice bazaar first before you head on to the other attractions.
Some things about the apartment: it has two single beds pushed together, not a double, so if you need a firm mattress, this is maybe not for you.
There's a cleaning service, which is great because they come in every day if you ask (and some days even if you don't ask).
There are also staff on site if anything goes wrong and Okan was quite quick in responding to issues as they arose so that was cool too.
Things aren't quite as polished as in the pictures but that's okay -- everything is there and clean and it's good for if you're staying for a few days.