We had a great time in Berlin at Tia's apartment - it's really well equipped and looks even nicer than in the photos! We were a group of six, staying three people to each bedroom, and found that there was plenty of space. Having two sizeable bathrooms was great, as was the large open living room/kitchen.
Tia was great to liaise with - easy to contact and quick to respond. We were due to arrive late, which turned out to be later due to a delayed flight - Tia was able to meet us at the flat at the later time which was great.
Would definitely recommend staying here!