All of my past apartments have been ground floor, there are pluses and minuses like the others mentioned.
It IS much nicer for moving in, hauling groceries in, being able to put a bike inside at night. It tends to be cooler in the summer, although not as warm in the winter.
That said, if it's an iffy area the fact that your windows are all ground-floor can be a bummer. In one neighborhood in particular, I always worried about leaving my windows open at night because break-ins were fairly common. This may not be an issue in your area.
You most likely will hear the people above you, but how loud it is depends on factors like the thickness of the floors, whether there is carpet vs. hardwood upstairs, etc. If you're sensitive to noise, I'd ask if the apartment upstairs is carpeted and what room your bedroom will be under. The worst noise I dealt with was when my bedroom was directly under the kitchen of the upstairs apartment. Upstairs neighbors were always in the kitchen cooking, hanging out, dragging chairs around all night, and it was bloody loud. But I had another place where my bedroom was under another bedroom, and it was carpeted, so that was much quieter (except occasional, ahem, bedroom noises). Most noise becomes background noise at some point, the worst is when you're sleeping.
So basically, pluses and minuses. You have to decide whether particular factors would bother you. Personally, I'd prefer not to live in a ground-floor apartment but it wouldn't stop me from moving into a place I otherwise loved. But I'm someone who doesn't mind stairs and is sensitive to noise and safety.