I really enjoyed my stay at Stefan's and would recommend the apartment to anyone coming to Berlin, both couples and lone travellers. I was there by myself for a conference and felt right at home at Stefan's. Him and his girlfriend were very welcoming and helpful when I arrived, and very laid back during the week. The room was lovely and I slept very well. The apartment is perfectly located for Berlin, and also felt safe walking back alone at night. I'd stay here again.