Martina and Charlotte's place was a good stay but not my ideal pick. There is decent room for clothing, including some hangers. I liked the location because the street is lined with great restaurants, cafes, and shops. It's not far from the Kotbusser Tor subway stop, as well. The apartment itself has good heating that was easy to control, and a heater in the bathroom for drying towels that was convenient.
The two big downsides were the poor wifi and the hot water heater. The wifi was awfully slow for me, moderately slow for my mom. The wifi comes from a router that's not actually in the apartment, and it is also not a secure network. As well, about half of the apartment is too far from the router so you lose your connection. Sometimes we would be connected to the wifi but the internet was so slow that nothing would load.
The hot water heater was less of a problem but it seemed like there was only enough warm water for one person to shower each day. Beyond that, one time the fuse went out for the hot water heater while my mom was taking a shower so it turned freezing cold. When I messaged Martina, she was at the apartment in 10 min and helped us figure out that it was the fuse and made sure we knew how to turn on the heater once the fuse was reset (a definite plus that she responded so quickly). She said the fuse will blow when there are other things being used, like a hair dryer, so don't do that, but we only had the heater and lights on.
A few minor cons were that there were some dirty dishes, the lighting near the beds is sort of impractical, and the table is wobbly.