Urban Fantasy has a lot of cross over with Low Fantasy, but it's pretty clear what the difference is. Harry Potter is a low fantasy, because it's set in the real world, but not an urban fantasy because it's not in an urban environment. Rivers of London is a low fantasy, but also an urban fantasy, because London is pretty urban.
If you like in a city, or decent sized town, there is something compelling about reading a fantasy novel set in the sort of places you spend your day to day. So if you are one of those people, you should give it a go. You might get a bit of a kick out of it. Like if Frodo and Sam had to deal with a late bus on the way to Mount Doom. Or if Tyrian and Cersie kicked off outside a Wetherspoons.