I stayed about 2 1/2 months in Aura Suites Istanbul for a business assignment and I had a great stay in this appartment hotel. You feel much more comfortable in such an appartment than in a standard, even superior hotel room. To make a long story short: it was fully clean, safe and quiet!
In more detail:
It was clean - I can say, it was 100% spotless clean! There is a full room service about twice a week and additionally every day, the most important parts of the appartment are cleaned. The whole building and the whole appartment were perfectly kept in good condition.
It was safe - well, to be honest, I had some doubts whether I'd get a feeling of unsafety in a city like Istanbul. I never had, even in times of political demonstrations. The area where Aura Suites is located, is fully safe due to lots of highly secured army accomodations and the coin-production site. In the hotel itself, the reception is staffed 24/7 and if you might come back in the middle of the night and the receptionist might not be at his desk, you have to ring the bell and someone appears immediately to open the door. That means, no stranger could enter the hotel without permission.
I was quiet - I never heard anything from other guests, no toilet flush, no laughing, really nothing.
Well, the fact why I did not rate the hotel with the maximum 5-stars is the following: the company I was working for booked an appartment in the top floor of the hotel. These rooms are smaller than the others (but fully sufficient for 1 person) but have very low ceilings / roof pitches. So, if you are tall, you might get problems when using the kitchen and most parts of sleeping and living rooms are too low to be really used.
So - I can recommend Aura Suites to everybody, but check whether top floor appartments are appropriate.