Gosh, thank you so much - JO -! Yes, the classification is an idea I had a few years ago to immediately set apart Temples (T) and everything that is a dive/tavern/hotel/etc. (G, for "Gasthaus" in German), since these are relevant to players in different ways. (A) is used for things only relevant to this Adventure and are excluded when the map is used in another context. The other labels (two letters) are only to differentiate the quarters. Again, thank you! =)