The loft is just lovely and perfect. I would rent it again in a next visit!
Karen is a great host, she made our check-in/out very easy and gave us usable guidance to find nice and local places to eat, shop and entertain, actually some beers to refresh ourselves, traditional cookies and coffe as well.
All amenities are really nice an the decoration is by author in all details so you'll find yourself living in a modern small gallerie.
If you use the bikes provided, you are done! - It means you will be in almost any attraction in 10-15min or less and living the experience of riding the bike in Amsterdam. We did a lot in 3 days!
Also public transportation is at hand so in summary, Karen's place is a great option to be a tourist living like a local.