Sui and Evren are incredible host and very accommodating. They tried to fix what ever issue came up. However this place is suited for short term and those that are in Istanbul to spend most of the day out. The place was clean and smelled clean. The location is great for visiting the old town and Beşiktaş you can walk down the street to catch the tram. Getting to the Kabataş ferry to take you across the Bosphorus is easy. However, going up to Taksim does require a hike up a steep hill.
In no way is this situated for someone that is planning on staying long term or is going to be working from the apartment. Akyol Sokak (street) is a very busy and noisy street. Cars honk their horns incessantly. There is no view. The immediate local restaurants are limited. Also, if you have mobility issues, this isn't the place. The bed is very low and the shower requires a contortionist's act. Very awkward.
If you're going to stay here for a few days you should consider this place.