Greenspeed Anura or Hase Kettweisel. The Greenspeed's quite a bit less expensive (relatively speaking), the Hase handles better. Both are trikes with 2 wheels in back. The seat height is in between what you're used to and what you typically see on the 2 wheels in front trikes. Hills are easy because you can gear down and go as slow as you want with no instability issues. 4'10" is not an issue. Both have good quality components.

Storage is interesting. Simply pop-a-wheelie and the storage footprint is only about 6 sq ft.