Nihat's place is located at a 5 minutes walking distant (downhill) from Taksim Square / Istiklal Cad. The neighborhood is beautiful, safe and peaceful.
The room and washrooms were always clean. Nihat is always approachable through phone, also he stayed up till 1 am because my flight to Istanbul was delayed. He gave me the local travel card and city tips to make my Istanbul stay more convenient.
To go to Sultanhmet one can walk 5 mins downhill to Kabatas tram station (I found it more convenient). For Metro connectivity Taksim metro station is 5 mins away (uphill).
Also, the place is value for money. I strongly recommend Nihat's place if you plan to stay in Taksim/Beyoglu.