Chin Yen is very quick to respond to all my messages and questions. This is a very beautiful apartment they have, it's very spacious and clean. It has enough beds for 6 people. The Sisli metro station is about 10 minutes walk (or less). There is one down fall for myself and people who can't take too much heat is that there aren't any air conditioning (there were fans but don't do justice to you when you are boiling), but other than that it is the best place you could ask for (feels like home). To be honest it's the perfect location to be in, I would definitely recommend Chin Yens apartment and if i'm back in Istanbul I will definitely be booking this apartment again.