Christian & Rachel's place is both affordable and centrally located. Hosts are courteous and helpful when it came to things like laundry tips.
We only rated 4 out of 5 because of the bed quality; the mattress was far too thin and thus the bed was hard. We were not able to rest fully after a long day of walking in Berlin because of the mattress quality. Previous reviews noted a comfy bed so perhaps this mattress was recently replaced and needs time to be broken in? In any case, it wasn't comfortable. Otherwise, this place is a convenient stay.