Thanks for your comment! I didn't realize that by backside they would mean Frederika Runebergin katu but it makes sense to me now.

I moved the hotel node back (but I went ahead and put it inside the building, norm for amenities). 

I also changed the road class from service to driveway. Driveway seems more accurate to me and some routers might avoid routing via service roads. (Altough I couldn't replicate the problem with routing, I tried dragging the destination node around the building and I had to be pretty far into the backsidan to get it to route via the other road.)