Location, cleanliness, quietness, quality of breakfast and friendliness of staff. Alas the reception is unstaffed after 18.00 or 20.00, and no phone number is provided to call anybody (admittedly, a case of emergency must be rather rare, but you never know).
With a stay at Hotel zwischen den Seen in Waren (Müritz), you'll be within a 15-minute drive of Mueritzeum and Volksbad. Featured amenities include complimentary wired Internet access, complimentary newspapers in the lobby, and dry cleaning/laundry services. Guests may use a roundtrip airport shuttle for a surcharge, and self parking (subject to charges) is available onsite.