The stay at Diarmaid's and Tina's was excellent. The apartment itself is cozy and well equipped, and the high ceilings make it feel very spacious. The building is very nice too and the little terrace invites one to spend the evenings outside. The Airbnb is well located and very close to both S- and U-Bahn, allowing for easy access to all parts of the city. There is also a variety of shops close by with everything one could need, as well as a few cute little cafes; we personally recommend Smula, a mere 10 minutes door to door. Communication was great, they responded within minutes.
We really recommend anyone visiting Berlin to stay here and hope you have as great an experience as we did!