I contacted mostly with Aglaja through sms and emails and she did a great job in preparing for logistics and house information to us. We spent 2 nights at this place and we really enjoyed the facilities and the cleanliness of the gallery. We strongly recommend travelers, who are looking for a great night stay near the city centre and the main tourist attraction places, to stay here!
In term of transportation wise, it's just less than 50 steps from the subway station (U2 line) which will connect you to several parts of Berlin.
Ronald, Aglaja's husband, also did a great job in welcoming us and took us around the place. He provided all critical information to us on the first meeting as well as kept in touch with us through whatsapp most of the time.
I'd have to say it's our pleasure to stay at this place and I'd strong recommend those who plan to visit Berlin considering to stay at this place. You shouldn't miss this!