That's a Miele S514 Solaris Electro Plus
It was the TOL Solaris series. They made a yellow straight suction Solaris, a very light blue Solaris Turbo Plus that had a turbine carpet nozzle, and yours, which has a 217 power nozzle. It's from around 2004, probably, but the tag on the bottom will tell you the year and the quarter of that year in which it was manufactured. Yours has the 1100-watt motor, so it's one of the older ones; the later ones had 1200-watt Vortex motors and direct-connect hose, wand, and power nozzle. I think they retailed for around $600, so you got a good deal on a vacuum that will last forever it the previous owner took good care of it.