Wasim is the staff in the building, he is very helpful and offer a simple orientation during check-in procedure.
I have stayed for 2 nights, and location is in Taksim, very convenient to walk to Taksim square. The area is safe and easy to get around as Metro is within 5 mins walk. Highly recommend if you would like a good location and living space bigger than a hotel and with clothes washing facility. Just one note: Hot water in the bathroom is not consistent. When mention, Safa said he would fix it. Walls are a bit thin, could hear the neighbours talking, but not an big issue for me. Overall, it's a nice place to stay at.