I do not think so that they will allot rooms to people "without scholarship" first, I think they are just waiting for all the admitted students to enrol first so that they allot rooms collectively, it will be easier for them too. And, I was in touch with an alumnus and he said that it is very normal, they will might reject your offer even if you come from mars and have a full scholarship, just do not lose hope, apply for some other accommodation options meanwhile and relax!
And as far as "changing linens" is concerned, I got to know that they will regularly change it for us ( like once a week or once in 15 days ) and this is very normal thing, In all other hostels they also provide this service.And, once you get admitted, I suppose you can ask them to remove this service from your application/package!