We stayed at Galateia Residences for 1 week and it was wonderful. The location was ideal - close to the metro and tram station, as well as many great restaurants, shops, and of course, the Galata Tower. It always felt safe, and in spite of its proximity to Istiklal St., was very quiet. Win win!
The apartment itself was spacious and very comfortable. The bathtub was heavenly after a day of walking up and down Istanbul's hills.
The staff was also very helpful and quick to respond to any questions or needs, even ordering us a taxi for 6 am. We also appreciated that the laundry room was stocked with detergent etc., as it saved us some hassle.
We would certainly recommend this place without any hesitation to anyone looking to visit Istanbul, and would return here in a heartbeat.