We were a family of 6 adults and hence found the apartment just right for our requirement.
The apartment is an excellent and safe neighbourhood and quite modern and had everything that we needed and it's walking distance from all things practical groceries, touristy things and also the river.
Christoph has been thoughtful and provided all the instructions and leaflets in a folder for us to refer to.

the only thing I would recommend checking is the heating in the apartment if that is a concern to anyone - Vienna was quite cold and we couldn't get that to working but was taken care by Thomas on our last day.