Housing…
Each participant will need to line up their own housing situation…hotel…hostel…friends…etc

Housing helps…

Paris:

Oops Budget Hostel
International Youth Hostel
Hostel World
Booking.com
Hostel Bookers
Ibis Hotels
The George V…

Amsterdam:

The Shelter

A fun way to stay for free is: http://www.couchsurfing.org/

Cost…
2 1/2 day experience: 150€

1 day experience: 70€