I really enjoyed my stay at Raven's! The apartment(s) is/are situated above a chill bar that has good beer, good wine, yummy snacks and a really cute cat that hangs around!
The apartment is definitely big enough for two people - with one full bed and a pull out couch that's fine for a good night's rest.
We found the place to be clean - it has a great rain-style shower, lots of towels and pillows if you need extra and the hosts downstairs were not only lovely and accommodating, but gave us all of the information we needed to navigate the area.
The apartment on the first floor is right above the bar - so if you're a light sleeper, as for the apartment on the fourth floor.
My favorite part about the location of this apartment is that it's on the side of the bridge opposite Sultanahmet - it's so close to Taksim Square and Istaklal Road where you have all of the same things you would find in Sultanahmet, but cheaper, more unique, and nobody heckles you to come in or buy something - so it is much less of a tourist trap.
If I were coming back through Istanbul, I would absolutely stay at Raven's place again!