Our hosts were stellar- they provided accurate and helpful information about Stockholm, and were both kind and generous. The dog was well behaved.
The room is set in the little cottage next to the castle, and is definitely cozy. Walls are a little thin, and the bed was a squeeze for two, so keep that in mind. On the other hand, you have access to a great shower, and kitchen. The room was immaculate, as well as cute.
Location was a 3 min walk to a key T-bana line, which is itself a 5 min ride to city center.