I found the number to call for a room only reservation. From the US it is: 011 331 60 305 305
You may want to call and check the rate difference for staying on property.
When I was making my reservations from home, the reservations agent called me back so I wouldn't have to pay an expensive phone bill. I was very grateful for that, even though I do use a special access code to call overseas and it only costs about 10¢ a minute to call France. I do know that call to the UK are 5.9¢ a minute. PM me if you want more info on this service.
I was just there in Feb. for 2 nights. You can go to your local AAA office ( don't have to be a member to get info) and pick up a package brochure so you can see the different hotels and compare them. I also ordered a brochure from the
www.disney.co.uk site, the prices are in British Pounds though. You can also compare the hotels on the official site
www.disneylandparis.com/uk This will give you the site in english.
Depending on what time you arrive on Wed. morning you may not want to go to the Parks that day. The day we arrived, DH, DD8 and myself went to the parks, but our travelling companions did not. They had not flown to Eurpoe before and the flight from New York did them. I think you will have plenty of time on Thurs. and Fri. to see both parks. I beleive they sell a 3 day pass at the gate so that may be an option for you as well, if you want to go to the park on Wed. The reservation agent will be able to give you park prices for that time of year - their prices change depending on the season.
I hope this info helps you.