I loved to stay at Hakan's place!
The place itself is very nice and cozy with all the amenities you would have in your own apartment.
The apartment is very nice located in Kadiköy /Göztepe, a quiet university area.
It is super easy to move around and visit Istanbul from the apartment. You have the metro station Feneryolu just few minutes (walk distance) away and plenty of buses also around the corner. Taking the metro you will be on the European side in just few stops.
Also the area around the apartment you can find many coffee shops, restaurants, grocery shops etc... and at the park close by you have every Wednesday the organic market (Kadiköy Organik Pazari).
Istanbul is soooo beautiful and turkish people are very nice and welcoming , I totally suggest you to spend your holiday at Hakan's place, you won't regret it!!