While I can't guarantee your villa experience... as I've never heard of yours. Be assured that this is a GREAT decision as you will truly fall in love with this island. Just don't let hickups become turnoffs. Any trip can have some, but none will happen in a place as beautiful, wonderful, wonderous, and comfortable as St John, USVI.
Yeah - its always a nice feeling to have a trip booked. What a beautiful villa too. Can I ask which airline? $238 from DC is a great price! Is it from Reagan or Dulles?
The $238 fare is on USairways out of Reagan (but you can get the same fare out of Dulles). As of right now, the fare is offered on certain days each month between now and next June.
I use www.itasoftware.com and do the month long search and it will show you which days are least expensive. What month are you looking to travel? I can pull it up quick and post the snapshot.