I agree that l will depend of your height. Helix frame is relatively short and won't fit well for tall people.

I think you should also consider the comfort.

And I doubt that Helix is a comfortable bike.
It has no suspension at all, the lefty fork will be very stiff, the rear triangle will also be stiff and the tires are relatively narrow+ high pressure (no possibility to mount balloon tires like the Big Apple).

I think that even if it has smaller wheels, a Birdy will better fit your needs: full suspension+balloon tire, fully adjustable seatpost and stem (in height + two types with two different tilt to be chosen depending of your height).