We were 3 adults and two small kids staying at the apartment and we felt the size of the apartment was okay for us. The communication with the hosts was easy and they were flexible with check in times. The location was fantastic and we loved being so central and still in a quiet street.
However I cannot fully recommend the apartment. It was extremely cold in the apartment. This is obviously only a problem for the winter months but may be worth to mention for guests traveling in the winter. The hosts provide small portable heaters but the bathroom and kitchen were impossible to get warm, we were really freezing. Another downside was that you hear literally every single word the neighbours are saying. And even if they were not saying something you hear every step. So even with very considerate neighbours you will hear them quite a bit.
So for people with a light sleep or people who are sensitive to noise, this might not be your apartment.
We still enjoyed our trip a lot!!