We had a great experience with our stay in Murat's place overall. Communication was easy with him--he was friendly and accessible whenever we had any questions. He also gave us great suggestions about things to do around Beykoz and where to eat and shop.
We rented this place to get together as a family in Istanbul; some of us needed to work remotely too. Murat's place worked perfectly for us. It was very well decorated and had everything we needed: any kitchen tool one might need for cooking/baking, large living space, and plenty of space for work (wifi was not so fast--it took a while to attach large files in my email--but my wife and I were able to work simultaneously and have video calls). The place also has two porches and a beautiful garden with great view, birds, cats, and dogs (which can be a bit too loud in the night time if you are sleeping with the windows open). There were two other neighboring houses next to this house: one was empty during our stay and the other one was occupied but not really visible thanks to the trees in between the houses. We could hear the neighbors, especially when they are in their porch though, but it wasn't so bad.
The house is located in a generally quiet and green part of Istanbul. We really enjoyed our walks in nature around the house and in Polonezkoy, which is nearby. There is an easy access to Istanbul Airport by car, without having to worry about the heavy Istanbul traffic. It is also fairly close to the more urban parts of the city.
Overall, we had a very pleasant time in this place. We would highly recommend it if you are looking to stay close to nature and have a peaceful stay while still being close to the city. We hope to come again.