I took a test ride and thought it was heavy, although that may have been corrected on later versions. Small diameter wheels amplify bumps. Every bike with wheels less than 20" I have ridden felt unstable.
"I am a 55 year old (out of shape) woman looking for something only for short hops"
I think Strida would be better unless you are very short and don't fit on it.
In the same class as mobiky you might consider dahon sweat pea or the downtube mini.
A rake that clamps to the seat post seems possible. It may interfere with folding.