if top floor still have unsold unit, why not choose it?
at least you wont have the issue of being annoyed by upper unit

dear, heat & roof leaking can be solved, as it is physical structure in nature
but smell and noises you cant solve it, as it is human behavior in nature
if i were you, i would choose physical structure in nature to resolve. human behavior in nature is always hard and never able to be solved because you cant change their mindset
similarly i cant change your mind for opting middle floor rather than top floor