We stayed five nights at Ilhan's, and it's been absolutely great. We got to the place, Ilhan had fresh pastry on dinning table for us and we're offered advice on where to go for food, etc.
The place is situated in a traditional quite Istanbul neighborhood, about 9 mins from Istiklal st. (a plethora of shopping options, restaurants, cafes, pubs), 13 mins walk to Taksim.
For those who'd like to rent a car, there is a 24-hour car park, 3 mins walk.
All in all, we were very pleased with everything, and Ilhan was absolutely great, replying in seconds to all our texts.
Highly recommended, and we will be going back.