This is the former Sankt Clemens church which gives the hotel its name. It's quite agreeable, with some runes carved into it and a resident cat. You can go and have coffee there in the afternoon, although I had my look around it in the evening.
I do like the way that Sweden implements contractions with a colon, so the name is written "S:t Clemens". If we did this in English, I wouldn't have to keep explaining why "Saint Clement's Street" is shortened to "St Clement's St.", because the distinction between an abbreviation and a contraction would be clear.
Then again, for all I know they may only do it for Sankt/S:t and not other contractions such as Doktor/D:r.