you can request first floor.
the ones with the elevators are 62, 63 & 64 - the newest so they are requested the most.
the problems with a first floor studio - your view could be of the air conditioning units, you don't get a view due to overgrowth of the shurbs and burshes (for privacy especially for the 1-bedroom), or you might get a handicapped room.
but you can definitely request one. those things are heavy to hauling up and down steps.
that say - hauling that thing on and off the bus will be a big pain. Can you find something easier to haul? remember it must be folded up and not in the way of the other guests.