My friends and I had a really good time at RAVEN. The apartment is clean and well equipped, though it is small they managed to make the most with the little space. The balcony is nice to relax after a long day of sightseeing.
For those sensitive to noise at night, this apartment might not to be the best solution as it is in a quite lively/noisy area.
The apartment is very conveniently located, easy to get to the main sightseeing spot, right next to the main shopping street and in the middle of Istanbul's restaurant and bar area.