The apartment is central and the check in and check out system is quite easy and simple.
To improve: I think they could provide baby cots or simply not accept bookings with children. I had to sleep with my baby in bed because they literally told me after making my reservation that they did not have this service.
On the other hand, I think you can have some details that I have found in most of the Airbnbs that I have booked. A bottle of water, additional cleaning cloths or cooking oil are small details that could improve the stay of your guests.