Neslihan and her husband are super nice and kind people. They were helping during 1 month when we stayed there. And always answered when we needed something (even helped with online shopping in turkish shop which didn't acept international cards for payment!).
Very spacious apartment, I liked location of it: we could find there a lot of supermarkets, street market in 10-15min by walk from the house with fresh tasty food and great prices (works on Friday and another one on Sunday), close to city center, near 30min by walk to the closest metro. There is a lot of light in the apartment. Firstly we noticed that table - bar counter - was too high for chairs, but during several days husband of Neslihan fixed it, and we got one more table to sit, work and eat, WIFI was good and fast. You can use washing machine (that can dry your clothes at the same time but it takes time).
In this apartment you can find even full equipment kitchen with oven (usually in Istanbul you can find only small stove to cook but here you could use even big oven to bake something), there are a lot of good quality of pots (not cheap aluminum, made from stainless steel, big fridge. I really enjoyed our staying.
But if you travel with someone else (2 person) be ready that bed is not so wide. And sometimes you should wait till hot water comes back during taking the shower (probably there is a common water system with another room-apartment at the same floor).
P.s. Be ready to have workout for your legs because apartment is on a slope (as many other apartments in Beyoglu), so I would reccomend you to use the taxi if you have heavy luggages when you come there or leave the house.
Thank you for hospitality and help, amazing Neslihan! Hope you will have only good guests with big heart :)