There are several smaller hotels, bed & breakfasts, guest houses and appartments in Stralsund.
You can find these on e.g. booking.com, airbnb.com or the Tourist Office of Stralsund.
Here are some examples of hotels:
Hotel Alter Hafenspeicher
www.hafenspeicher-stralsund.de
individual appartments, good for sharing, located next to the Ozeaneum
Hostel Stralsund
https://www.hostel-stralsund.com/?lang=en&setlang=en
low budget, single / double rooms and dorms available, located close to the Ozeaneum
Hotel Kontorhaus
www.hotel-kontorhaus-stralsund.de
small quota of rooms, located next to the Ozeaneum
Hotel Baltic Stralsund
https://www.viennahouse.com/de/hotel-baltic-stralsund/das-hotel/uebersicht.html
10 min walk to the Ozeaneum
Intercity am Bahnhof
https://hrewards.com/de/intercityhotel-stralsund
close to the trainstation, 20 min walk to the Ozeaneum
Hotel Hiddenseer
www.hotel-hiddenseer.de
small quota of rooms, located next to the Ozeaneum
