Social toilet yes, I saw one many years ago in Turkey, I am unsure of the proper name and the link is definitely not very academic, but it has a photograph of what I mean, it would be a room, usually with seating running down the length of the walls with a water filled trough running underneath the benches, you know the Romans, everything was a social forum to them.  http://www.alphagalileo.org/AssetViewer.aspx?AssetId=54065&amp;CultureCode=en&amp;MaxWidth=800&amp;MaxHeight=400

As far as still being technically applicable, not so much as the measurements are concerned, more like things such as orientation to winds and cardinal directions people in the renaissance were starting to discover was how much thought went into the buildings of old, one thing the Romans used to do was to plant trees in front of windows that loose their leaves in winter, so as to shade open windows in the summer keeping the inside cool and then let light threw for heating in the months when the tree shed, a practice that continues to an extent to this day..Yes, lots of people build modern day examples of roman villas that are pretty copies of classic buildings, however i'm referring to the amount of engineering that went into houses of old, it was absolutely staggering. Today's builders of sustainable houses could learn a thing of to from a culture that found ways to cool their houses without climate control or electricity. The Romans were the master of engineering and The Four Books reintroduced the world to how that applies to architecture. I hope that answered your questions, if not please let me know.