Asli's flat is conveniently located near to place taksim while being in a relatively calm street. So it is a very good location because it is close to bus connections to the airport for example. The flat is also close to the busiest and nicest parts of istanbul. There are 3 flats in the building and I got moved to a better one for a lower price before I came. On top of that Asli proposed me to stay for free for a couple days if my flight was cancelled. She was a very helpful and generous host. The Internet was good enough to work remotely over VNC. There was a washing machine.
So all in all, a good, convenient flat and a nice host!