This place is absolutely beautiful. The view from the balcony, the design and overall atmosphere are really nice.
Location is superb, transportation is easily accessible, the lively Istiklal street is just around the corner, there are several grocery shops down the street. Safe neighborhood. But the street that leads to Istiklal is very uphill and because of the central location, it gets a bit noisy till about 1 am. That's not obligatory a disadvantage, but rather something one should consider.
As for the downsides, the communication with the host was very poor. I had to remind of myself several times before I could get an answer to my messages. Could only get self check-in instructions while being on my way from the airport. Upon reaching the flat we discovered there's no wifi password provided and no iron, although I specifically asked for it and was told it's available. Luckily at this point, the host started to respond to my messages promptly and brought us iron the same night.
The flat is quite comfortable if you're traveling solo. But if you have companionship the open planning of the bathroom becomes an issue. I loved the overall design of the place, but I can't understand how the glass wall between bedroom and bathroom is only half size. It doesn't reach the ceiling, so there's no smell nor sound proofing. And we all understand a flushing toilet sound is quite loud, especially in the night hours. Also, there was no bath mat.
It didn't seem like there was a recent clean up in the flat, the shelves were dusty and floors needed some wiping.
When we had a chance to finally meet the host he seemed like a charming and kind person that was there to help. But the thing is, all of the mentioned above were also complains in other guests' reviews and never taken into consideration. So at this point, you hesitate to address any of your needs to the host.
I would come back alone and recommend the place if the host considers the critique.