Roi’s place is very stylish, super quiet, and in a terrific location, just a few minutes walk from the Wittenbergplatz. The air conditioning worked very well, and the kitchen is nicely equipped. You should think of it as a luxury hotel room with a kitchen.
One drawback: there is no table and chairs, and no desk if you need to work. Instead, there is a breakfast bar with 2 stools. For most guests this will be fine.
Finally, I recommend arriving during daylight to make it easier to enter the place. You have to unlock an outer security gate, then a building door, then the apartment door with a different key.