A good inexpensive option in the Center of Flensburg, adjacent to the Town Hall Square, near the promenade.
There is paid parking right in front of the hotel, but if you need a discount, you need to park somewhere else (check at the Reception), English is understood.
You should always hand over the key at the reception when you leave the hotel, it's a little sad. But, in general, there are no questions, neither breakfast nor rooms.