Big cottages/accomodation in the peak district?

Looking to go away for the weekend on the 3rd April this year with about 12-15 ppl – anyone know of any good places to stay that might be available and not ridiculously expensive?

There is a preference for the peak district as everyone is coming from different parts of the country but ppl might be persuaded by the lakes or wales if there was something good.

Cheers.