The room is exactly as shown in the pictures. The single bed is comfortable, and the place is great for a short, affordable stay in Berlin. Ron is good at responding quickly to communications even if the messages are in German, but Google translate works well for that. He does an excellent job of explaining things in English during the check in process, and shows you around the room, bathroom, and kitchen so you feel comfortable using those spaces. Internet was fast.
There wasn't actually air conditioning directly in the room itself, but the temperature was comfortable during the heatwave.
One negative to the room was that it is quite dark. Ron has set up the room so only one dim smart bulb lights the entire room. While the smart bulb is pretty cool to switch colours, it is definitely harder to read or see anything in that dim light. It would have been nice to have a bedside lamp for added light.
The place is about 25 minutes away by subway from the main tourist attractions. His place is just down the street from the subway station. There are lots of tasty restaurants in the area and a couple grocery stores a couple minutes walk away.
Ron has a friendly dog named Bob who usually stays upstairs, but he will be in the kitchen and he likes to sneak into guest areas to get some pets.