This isn't very BA related so will probably get shunted elsewhere on the forum, but I was in the No. 1 traveller at EDI a few weeks back and it was fairly pleasant. Toilets are in the lounge if I recall correctly. Its quite open-plan but there are desks you can work at.

In general No 1 lounges tend to be very consistent across locations in terms of their offering and are better for food (although personally i'm not a fan of what they serve, too greasy or salty for my liking, and their bistro menu portions are teeny-tiny) and have a nearly proper bar service (soft drinks/coffee you have to sort yourself). Aspire are much more hit and miss and are quite often under staffed. I haven't tried them at EDI before.