I was there last November.

The lounge is fairly small. Fits about 12 people on about 4 large sectional sofas.

There's a small selection of soft drinks and wine / beer as well as snacks and pre-packaged sandwiches.

The lounge is located to the left once you pass through the screening process (I think).

I was flying BA J but would have still been allowed access as a BA Silver. So maybe OW sapphires are allowed access too.