Here is a link to CAPA's Seating Chart. http://www.capa.com/columbus/venues/ohio_virtualtour.php
Having attended many performances in this theatre, I would say that the lower mezzanine is an excellent location. I would never go to the ballet without my ancient (large) binoculars for regardless where my seat is, I am always wondering exactly who is who onstage.
I prefer the orchestra level about 1/3 the way back; but be carefull not to take tickets on the sides Orch 1 and 4. As long as you are close to the internal aisle you can see the whole stage.
Giselle will be wonderful!