After being incredibly frustrated with German transport, reaching Tom and Arzu's apartment was like reaching home. We reached the place much later than what I'd communicated, but Tom was patiently waiting for us. The apartment was great, beautifully furnished, with very comfortable beds and a well-equipped kitchen (not that we used it for more than cooking eggs, but there was an egg spoon! and baking paper!). The bathroom was clean, a bit small (though this is pretty clear from the photos anyway) but had lots of hooks n adequate space for keeping toiletries etc. Tom was extremely kind (we didn't really get to see Arzu much, other than saying hello to her and their lovely baby), giving us much-needed reccos for food and places in Berlin; he even did a load of laundry for us, which was super-nice of him!
We had perfect directions for reaching them much before our trip started, and finding the apartment was easy. The metro and bus stop were both within 5-min of walking, taking about 10 min to reach Berlin Hbf, so it was very conveniently located. Definitely recommended!