We stayed in Boardinghouse Refugium for 4 Nights in the "Zauberberg". The House is just great. When we first saw it, a companion of our said, it's Sirius Black House from Harry Potter :-) but in a light version. Squeaky, crooked floors just add up to the whole experience. There are 5 Apartments, we were in "Zauberberg" and we were 3 adults and 1 child. I slept on the sofa and I don't recommend if you're planing a longer stay.
Other then that, the kitchen was new and very well equipped, there was everything you need - even spices and oil....
The bedroom was big with an anteroom, there is a one small bathroom with shower and a small toilet, there is no balcony, the apartment on the ground floor have small terraces.
The stairway is narrow but lovely, there are lot of books, games, brochures...lot of Information
about the city of Lübeck and its surroundings.
It was clean, but not impeccable clean.
The Location is amazing. You're in the old city but it's quiet because it's a small and hidden street.
The owner Ms. Thomas is a lovely lady, very calm and very nice.
Hope this helps.