My sister and I stayed in flat 17 for 18 nights.
Upon our arrival, we were greeted by the staff and were given the keys to the flat. The flat is very cozy and comfy and is identical to the pictures. Everything you might need is at your disposal (kitchen utensils, shampoo, body wash, hangers, hair dryer, dish soap...).
Mahsa was very responsive, kind, and welcoming at all times.
I definitely recommend staying in one Mahsa's flats if you're looking for a place that is convenient in terms of pricing, distance (as it is 10 mins away from Taksim square), and comfort.