Hi Gerard, we had a similar enquiry last year and the cruiser in question sent the following feedback:
We left the boat in Greifswald, a small, quaint and old Hanse town south of the island Rügen.

Situated there is the Hanse Yachts Wharf that offers full-service winter storage at a competitive price (some 20% less than most of the marinas we contacted in the area). The place is very protected weather-wise, as the town itself and the wharf are situated some 3-4 km inland, along a narrow river.

Access point is Greifswald Wieck, where the old bridge opens every hour at the hour (from 9 am to 8 pm, if memory serves) to allow boats and ships to pass.

Hanse Yacht Werf itself offers a full spectrum of services, from winter storage (as in our case, we will not be present when our boat will be lifted up), rigging services, sail makers, motor service and repairs, hull repair, painting etc and a well equipped marine store. A big yacht rental company operates in the compound, and all normal marina services are provided (toilets, showers, laundry, electricity, water etc).