Heinz's place was great. We were a group of 5 and everyone was comfortable in the spacious apartment. It was clean, very centrally located and with everything stocked and functioning well. The only thing that made our stay unpleasant was the agency that manages the apartments. We were able to check in and find it easily. But our first experience with them from the beginning was their rudeness and impatience. We needed a second key for our friends who would be arriving later, the woman acted very rudely and annoyed like we were hugely inconveniencing her for asking this. I wanted to check the price was the same as the Airbnb agreement and she seemed annoyed with me for checking my phone and tried to rush me saying she had to tend to other clients. It's best she let me check because she had not counted the nights correctly and she had to reprint the correction before I would sign the rental agreement. One of my favorite parts of using Airbnb is avoiding exactly these kinds of confrontations. We brushed it off and enjoyed our stay. On the last day, we needed to check out of the apartment at 10 am as other people were checking in soon after. We were of course understanding of this and are not upset about that. We asked the apartment agency workers if it would be possible to leave our luggage there, they said it's only possible until 1400 (2 pm). Our flight wasn't until 2200 (10 pm). We asked them to be flexible and grant us a few more hours extension. They refused. They suggested we walk 20 minutes with our luggage and pay to leave it in the train lockers near a part of town we were not going to at any point in the day. I explained to them we already paid a lot for an apartment and we don't want to wander the city with our luggage nor pay for lockers on another part of town. I have used many Airbnb's over the years in many countries and I have never encountered this problem before. Usually, it was possible to leave luggage somewhere. But I have always dealt with the owners directly never with a rental agency. I found them rude and inflexible at this point. Again we tried to brush it off. We had been out for 4 hours and we came back to collect our luggage at the time they deemed acceptable. Upon arrival, we asked to use the toilet before we wander the city many hours until our flight with our luggage in tow. They said it's only for their workers, refusing to let us use it. They suggested we leave with our luggage and try to find a public toilet. I would have understood if we were strangers off the street, they would rather it not be used as a public toilet, but as we were customers of their rental services I was sincerely surprised at their complete lack of empathy, flexibility and very disappointed in having to deal with these annoying inconveniences that hindered us from fully enjoying our last day in Berlin without restrictions of timetables and luggage issues. The apartment is nice in a central part of Berlin. Just be wary of the agency if you don't have early flight times and want to enjoy your last day in the city!