There is a railways station at CDG (terminal 2 TGV Station). It's very convenient, because the train (it's a very fast train) arrive directly to Tours (the name of the station is saint pierre des corps)
there is a train at 8h19 AM , arrival at 9h59.
The other train is at 10h16, arrival at 11h59.
The can buy the ticket at CDG TGV station.
At saint pierre des corps, I will be at the station to go at the apartment.
I send to you, next week, the different possibilities for the apartment.