From page 9 of the Guildmasters Guide to Ravnica seems to illustrate how the core conceit of the Setting fits the core definition of Urban Fantasy (except turned to 11, with things like the city built over the Oceans and under the Oceans thanks to the Merfolk and a couple hundred billion inhabitants):
"A mixture of technological advancement and sophisticated magic offers amenities to the people of Ravncia thst would be extraordinary to folk in most D&D world, except one like Eberron. The nicer neighborhoods of the city enjoy central heating and plumbing (thanks to the work of the Izzet League), elavators, and spacious apartments. Even poorer neighborhoods boast clean and smooth roads a d sturdy construction. No one needs to go hungry in Ravnica, because the Golgari Swarm provides a bare minimum of sustenance to anyone who can't afford better foo, though it is best not to think too much about where the thick gruel comes from. (In practical terms, even a character who can't afford more than a wretched lifestyle doesn't need to go hungry.)"
"The citizens of Ravnica enjoy plenty of leisure time, and the city offers an abundance of ways to fill it. Ravncia features restaurants with extensive collections of fine wines, cafes serving coffee and tea, street vendors offering portable meals, and bakeries that sell a wide variety of breads and pastries. Travelers can stay in luxury hotels or simple hostels, or they can a rely on their personal or guild-related contacts to find housing. Diversions and entertainment abound, including raucous street-side theater (including the circus-like spectacles of the Cult of Rakdos), operas and symphonies, illegal fight clubs, sporting events held in vast arenas, throwaway popular novels, and great works of literature. These things are shared by the city's diverse people, who enjoy a life adorned by a variety of species, gender identies, and sexual orientations. "
"Well-established systems undervird society, largely through the efforts of the guilds. The Azorius Senate crafts, cofifies and enforces a comprehensive (some would say oppressive) set of laws. The banks of the Orzhov Syndicate offer secure vaults and complicated financial arrangements. The Izzet League maintains the city's infrastructure, and the Golgari Swarm ensures that waste is disposed of (or recycled). House Dimir couriers deliver messages and parcels across the city, and the Simic Combine addresses issues of public health."
"Ravnica lacks any large-scale agriculture operations, its citizens depending on food produced in Selesnya Gardens and underground Golgarinrot farms. Few parts of Ravnica could be considered wilderness; the rubble-belts, areas where the city has decayed and been reclaimed by natural forces, are the only truly wild areas."