Radek's apartment is breathtaking and I strongly recommend you to stay here during your trip.
Radek and Eva are amazing hosts. They tried to make our time in Prague as comfortable as it gets. (every day they even brought us breakfast and waited for us to check in at very late hour).
The apartment is, because it's size, easily suitable for 10 people. It has 10 beds in 4 different bedrooms and is therefore suitable for large groups of travelers and not just for families.