I looks great, and I can see all sorts of possibilities. If someone had an apartment and didn't have room for a 5 x 5, that layout could work on bookshelves as an around the walls switching layout.
If it was built in a large basement with lots of "real estate" available, it would be a great start on a larger railroad. If it was in a corner so that access wasn't available all the way around, the spaces between the street and the curbs for the sidewalks would nicely hide a lift out access panel. For someone in that situation, they could have something to operate while the mainlines at the bottom of the picture were expanded in both directions to make a huge dream layout.