We were three friends who went to Berlin for a long-weekend, Wednesday to Sunday, and the check-in was very convenient with a key locker.
We discovered there were only bed sheets for two people and when we contacted the host we got an answer right away and they came to the apartment within 1 hour and left another set of bed sheets so it was great service! The apartment was clean and the kitchen included cutlery and other things needed for a few days holiday. The TV worked well, it's a smart TV with Netflix and access to regular TV. The double bed was comfy but the pull-out couch was a bit difficult to sleep in unless you are very short and can lie across the bed. Since there were no arm rests on the couch the pillow fell off the bed during the night when you moved around.
It takes longer than described to get into to town. If you visit as a tourist and want to go to different tourist areas and attractions you can count on it taking around 50-60 minutes to get there from the apartment. No matter where you're going, with all stops and changes from tram, to S-train to U-train that you need to make it takes a long time. The fastest way to get to Alexanderplatz (which is very central) is a 10 minute walk or tram 5-10 minutes to Grünau S-bahn, and then 35 minutes with one change along the way at Ostkreutz. The bigger stations are quite confusing and it takes a while to orientate how to change between different trains and platforms. The Berlin subway/trainsystem is not super informative at the platforms so it can take a while before you've found where you are supposed to go.
We were happy with the apartment but wish that there was a better description of how inconvenient it was to get into town by public transport.