QUOTE (Kay @ May 31 2008, 10:22 pm)

A very good deal, except that a Smart wouldn't be the smartest choice for a
family of five.
The OP did say a "small economy car", though, yeah, the Smart is the smallest of the small.
Sixt will rent to you for two months (you can price it out at sixt.de). Other car rental agencies may, I don't know. Make sure you pay for the collision insurance, because most credit cards won't provide coverage for rentals longer than 30 days.
Do you really need a car the whole time? Public transit is good, and then you can rent a car when/if you need one for a weekend or week or something.