We were 4 scientists staying at the apartment during a conference in Prague. The central location was very convenient; after networking (i.e. socialising) in the city center in the evenings we were always home in a few steps. It was very nice to have an actual, spacious house at our availability, instead of the limited space a hotel room would have given us. This also facilitated (too) long hours on the couch discussing the science we had heard that day. We only had one evening where our key plan did not work out, as we were 4 people with only 2 keys, a dysfunctional doorbell, and a US person with no phone service in EU. Additional sets of keys would have made our stay even more convenient, although we will now always have a story to tell on how one of us almost had to spend the night on the doorstep (a neighbour finally let her in, after which she could connect to the wifi and tell us to open the door).