I stayed at Sami's apartment on Akkirman Sokağı for ten days and it was great.
The place is in the middle of vibrant Şişli district however the street is relatively quiet.
The location is good for exploring the city because one can reach many places on foot, including Nişantaşı area, Maçka Democracy Park, Taksim square. One can also go downhill to the shore of the Bosphorus strait, reach Beşiktaş port and take the Bosphorus ferry trip.
Sami offered me a list of affordable restaurants; they are about ten minutes away from the apartment.
The room has an extra large bed with a very comfortable mattress, a wardrobe for guests stuff. I worked remotely from this room. The table is firm and large, WiFi worked without any issues.