We booked our trip with Vantage 8 months in advance. We were traveling with 2 other couples and we were told there were only 3 cabins available for the cruise we wanted to take which would be close to D-Day. On the ship, we heard similar stories from other travelers. Vantage keeps their prices low because they don't use travel agents - you book directly with them. Their customer service has improved since 2009 when we traveled to China with them. You no longer have to wait on hold for hours to speak to a customer service representative.
We booked the Paris extension and were put up at the Hotel Meridien Etoile. Our plane arrived at 7:30am from the U.S. and we were in our rooms by 11:30am. The hotel is located across the street from the Metro -great for getting around Paris. Headed out to lunch then on to Montmarte, Eiffel Tower, Champs Elysees, Arc de' Triomphe , shopping at Louis Vuitton (bring your passport if you want a VAT refund). The second day in Paris we booked a dinner cruise (through Vantage cruise director at the hotel) on the River Seine which I highly recommend! See the City of Lights at its finest and see the flickering lights at the Eiffel Tower at 10 while it's sparkling in all it's glory.
Sumptuous buffet at hotel with bags out at 7:30am to be transported to River Venture. On the Museum D'Orsay to see exhibits while staff on River Venture is saying goodbye to last cruisers and getting ready for the next one. Arrived on boat at 12:30pm. Cabins were surprisingly spacious Magnifying mirror (3x) in bathroom, I home radio which will charge early model iPhones and iPads. Large screen tv. Large shower for river boat and strong water pressure. Good wifi, Le Occitane products, sewing kits - everything you could possibly need. Dinner was shrimp cocktail, cream of broccoli soup, choice of chicken, halibut - mousse ice cream or cheese plate for dessert. Always a vegetarian choice too.
Cabin was spacious enough - could even walk around the bed. French balcony ( which means you can open the sliding glass door, but can't put your foot out. Plenty of hangers, two chairs, desk and little round table. refrigerator in room.