I stayed at Güner-Berivan’s apartment for 3 nights. The communication with the owner was excellent, he always responded to my questions without delay. The staff at reception are also very helpful and speak English. It is a good nice place to stay for a short time.
Location- it is a bit tucked away in a small back street. Takes a bit of time to find your way round the area. Istiklal street is not too far from the place. Then you can walk to Taksim Square and Galata Tower.
From Taksim you can get the metro or buses to any part of Istanbul.