I used Book2Park when I went overseas for three weeks and had a last-minute need to find a parking solution for the car. (The hotel recommended this service, which gave me encouragement that it was legitimate.) It was a lot more cost effective than using the hotel's economy lot, and very simple. I booked online, printed out the receipt, and showed it to the receptionist when we checked into the hotel the night before we flew out. I was a little confused initially by the instructions on the web site, but the process overall was very simple. I was provided a large hang tag by the hotel so they knew my car was supposed to be there, parked my car in the lot, and kept my car keys. (No waiting for a valet.) The hotel shuttle runs regularly and this hotel is only 10 minutes from the airport. Will definitely use again!