Franny's place was outstanding! It's on a quiet neighborhood street with very little (if any) street noise, but if you walk a few blocks you'll find excellent restaurants and bakeries, and it's within walking distance of all the major sites. Perfect location to make as a base for exploring the city.
The space has high ceilings and lots of space, the photos don't really do it justice, it had more than enough room for the two of us. It's also in one of the coolest neighborhoods of Stockholm (if you're into that sort of thing), very hip and lots going on. Highly recommended.