This accomodation is absolutely wonderful.
Position is perfect, four minutes by foot to Old Town square, two minutes to Karlovy Most.
Flat is really great: room are huge, living room is amazing, kitchen is will-equipped. And there is also a big terrace. We were eight and we lived perfectly (there are two bathrooms).
Only a small problem: check out is a bit early (10am), especially in Sunday morning after a weekend in this fantastic town.
I highly recommend,
Marco.