I suggest an upright model that is self propelled with disposable bags.
I recommend a top of the line Hover model because it's easier to find replacement bags and belts, and spare parts which you shouldn't need, but if you do, you'll be able to get them for many years to come. Or buy a cheap model that breaks in a year and it won't matter if you can't find replacement bags and belts. In most cases, you get what you pay for.