I have a couple questions about using a towncar service. I have never done this before, but I have used Mears and also have rented a car. I want to know is there enough room in a towncar for 4 adults plus luggage and carryons (backpacks) would a van be more suitable, with more room? Also, if we rent a van, would we be garunteed the entire thing to ourselves or would we be stuck with others? Third, is this faster than renting/dropping off a car? Please help!