Your height: 5'4" to 5'8" (161 to 171cm) approximatly (?).
Frame size = 21.25in/54.5cm
Comments:
Good looking, very little wear
Mountain Bikes: they are sturdy and designed to go everywhere including off-road. Good for rough riding. In general heavy and with deep thread tires slow on paved roads. Not good city bikes unless narrower and slick tires are installed.
12 speed: good to go just about everywhere except very steep hills. The range of different ratios are more than enough for most people. There are 2 front chain rings and 6 rear gears. - Derailleur: Falcon
Tires 26 x 1.75: medium width tires with small thread, for comfort on asphalt and occasional off-road.