The Amanas are beautiful and perfect for a girlfriends' getaway. Here's an article I wrote after an Iowa visit several years ago:
http://www.bedandbreakfast.com/report/oct-nov-02/story2.htm
Note the sidebar on the Amana's history. I toured Rose's Place, and thought it was friendly, charming, immaculate, and reasonably priced. That was over four years ago, however, so I would also look into the other options. Click this link, http://www.amanacolonies.com/accommodat/index.html, then click through until you get to the information on Rose's. They are not a member of BedandBreakfast.com, nor could I find a website for them directly, so if you decide to book, be sure to let them know how you learned about them!
Sandy Soule
http://www.BedandBreakfast.com
mailto:Sandy.Soule@BedandBreakfast.com
Sandy Soule
BedandBreakfast.com
Sandy@BedandBreakfast.com