Olcay apartment is very well located at the heart of Istanbul, two minutes from Istiklal st. and five minutes from metro and bus stations. Ideal for a couple wishing to discover Istanbul. Apartment is very clean, and the kitchen well equipped if you need to do some simple cooking.
Olcay himself is very hospitable (thanks for the nuts 😉), doing his best to facilitate his guests' stay. His support in providing access to Netflix was appreciated (although I couldn't use it as everything was in turkish, but the help was very kind).
Only minor things could still be improved. I would have appreciated access to satellite TV channels, to keep contact with the outside world.
I would also advise him to keep WiFi password posted in the apartment somewhere easy to find.
Overall, the experience was very positive, and I would recommend this apartment for people discovering Istanbul.