In terms of discretion, its on the corner of two residential streets and access is through a door in the back garden so you just duck straight into the side gate meaning you're not standing on the street in plain sight.
I've never bumped into another punter and always been in the same room but i think there is a second room so there could be 2 punters there at the same time.
It's also a permit parking area. I usually just park in Tesco's and walk up(need to spend £3 in store though).
Service wise, it's a vanilla pump and dump. Normally no kissing of any sort, oral is usually covered and anal is rarely on offer.
Also, the AW profiles are reused between girls so you'll find one day the name and pics will be one girl and the next day someone else as they rotate all the time.
I use them occasionally just for a cheap 60 quid fuck but wouldn't do an hour there.