The place is perfect for 1-2 people. It's cosy, homely, clean and tidy and has a lovely view over the city, which is a wonderful thing to wake up to every morning.
The little balcony is perfect to sit out and have coffee or a little lunch (even in the heart of winter :) ).
Isik is super friendly and responsive if you need anything at all, which always makes a stay very pleasant.
There is a gas hob to cook and some utensils and things but you might need to stock up if you intend to cook yourself (spices, herbs, that kind of thing). But it's great for a few days or long weekend.
It's so close to Taksim Square and Istiklal, so you're no more than 5 mins from restaurants, bars, shops, taxis and public transport, but you're off the Main Street so it's not really noisy.
All in all, the perfect little hideout in Istanbul! Loved it.