One of the bigger and more well-equipped theatres in Oxford (the New Theatre is bigger), this is where the bigger student productions and professional productions tend to be.
If they don't have the large-stage/orchestra pit, then row D gives you additional legroom, and is in the mid-priced band. Otherwise the seating will start at row E.
They have a very nice online booking system that lets you see which seats are taken, and select the ones that you want.
The café-bar claims to offer free wifi.