How much spending Money do you recommend for a week long Europe trip?

Maddie Watson asked:

Over spring break we are planning a nine day trip to europe. We are visiting France, Florence, and Rome. Breakfeast and dinneer are prepaid but I must pay for my lunch. All the hotel costs and subway tickets,airfair, everything is prepaid. Basically I’m asking how much spending money I should bring a long for shopping and souveiniers. Thank you!