as long as the body position is correct (most hipster lo-pros are not ridden with any semblance of correct position) it should not matter if top tube is sloping down.
the relation between your BB, saddle and handlebars (where you grip them) is the important thing, that imaginary triangle which pivots around the BB.
However, I'm not convinced of the handling on a bike with a small wheel up front and tight forks for city riding, that has to be a compromise for fashion purposes.
I bet all the old guys with 650 wheels in their garages are laughing now, they would have been next to worthless two years ago.
as long as the body position is correct (most hipster lo-pros are not ridden with any semblance of correct position) it should not matter if top tube is sloping down.
the relation between your BB, saddle and handlebars (where you grip them) is the important thing, that imaginary triangle which pivots around the BB.
However, I'm not convinced of the handling on a bike with a small wheel up front and tight forks for city riding, that has to be a compromise for fashion purposes.
I bet all the old guys with 650 wheels in their garages are laughing now, they would have been next to worthless two years ago.