A "comfortable double bed" refers to a large bed that can accommodate two people and is designed to provide a pleasant and relaxing sleep experience. Full definition
A modern cabin with comfortable double bed with a nice view. (unstadarcticsurf.com)
The bedroom has a large comfortable double bed and plenty of closet space for all your travel accessories. (shortstay-apartment.com)
Both bedrooms are spacious, furnished with comfortable double beds and please note that one of the bedrooms doesn't have a door. (shortstayreservations.com)