Does the apartment have access separately from street level or as per normal, through the common areas of the building?
Noise levels can be quite different. ie you hear specific street level noises from lower floors, whereas from the higher floors, there is usually the general hum of surrounding traffic, industry, cars. I always preferred the later.
I also thought that apartments, if possible should have a functional terrace/balcony with some views. Bit hard from ground level.