Lol- 4 People, Motorway and Ac. Hmmm... Yeah, perfect!
OT- I am sure it should be fine, since 660cc's usually do pack a punch, just don't get the 3/4 gear ones, they will increase your revs too high! Get a 5 gear A/T or Manual or a CVT one.
Make sure the engine is in top notch condition and the cooling system of the car.