Pleasant experience! Me and my family stayed in the apartment for 4 nights and the house felt like home. The place was really close to a U bahn station so going anywhere was convenient. Though the weather was hot and the room was without air conditioning, it felt rather cool inside. We didn't have a chance to meet Alex in person but he was very friendly during our contact. I would recommend this place to people travelling to Berlin, especially staying for more than 3 days!