Wow !! This has got to be the most compact, most economical (in terms of city funds) I have ever seen. I actually counted all the "unused" but usable "squares" in the developed area, and came up with a grand total of ............... 10. That's right there are only 10 empty squares within the city as it is laid out. Well Done !!
I learned a few things from this map.
1.) If every house has Colosseum (or I assume Hippodrome) access, it will count as "Perfect" Amphitheater coverage (for Culture scoring), even if you only have 1 Amphitheater in the entire city.
2.) Compact is beautiful. The more compact the city the fewer service buildings you need. This city has only 2 Engineers, 2 Barbers, and 1 Doctor.
One quick comment: I don't know how it works (or why) but in the "South Park" (OK it's a bad joke I know) you have two short strips of garden to allow some access to the rest of the city. As an experiment, I changed those gardens to roads with plazas, and after 2 years, two of the Grand Insulae had devolved to Large Insula, stating that there wasn't enough entertainment available.