First one word "splendid".
And now the monologue:
It was a clean and nice environment. Our hosts became our true friends and also competitors to TripAdvisor.
They showed us the most beautiful places of Istanbul, aside from the appartement it self, and gave us interesting lectures about the history of iconic spots.
When we arrived we were a bit lost but the hosts and the community helped us with free wifi, tea and patience.
The only thing that brothered me was that they helped us so much and that we couldn't find a proper way to repay them.
Best stay I have ever had.