Here are some images of a visit last weekend to the ZRH Aspire Lounge at Gates E (the midfield terminal). Operated by Swissport, you'll use this third party lounge if departing on BA from the midfield terminal. There is an alternative Aspire lounge for other gates.

It's a perfectly standard third party affair located one level up from the gates, the only notable feature being the outdoor terrace with good views of the runway and Alps beyond.

The design is inoffensive, although the lack of working USB ports is not. Some of the fixed armchairs feature pull-out tables.

Washrooms are located just outside the lounge.

There is a First Class section to the left of reception, but this is only open to F/Emerald passengers travelling with CX.