We absolutely loved staying at Serda and Tan's place in Beyoglu! The apartment is spacious, interesting, comfortable and very warm. They both treated us so nicely, gave us great information of the neighbourhood (hidden jems, such as local places to have great food and go out in the evening), and also recommended very interesting places we should see off the beaten track. We immensly enjoyed talking to both of them (and almost forgot about sightseeing!), because they have a lot of knowledge and many things to share about Turkey and other numerous things they are familiar with.
We would strongly recommend travellers to stay with them!