So far, I think it's charming: an exciting fantasy adventure in a modern setting. I think if you like other books by Neil Gaiman, you'll like this one as well. If you haven't read any Gaiman books before, this is probably a good place to start.
I read American gods and did not particularly like the lack of introduction to the world building. It felt like he was expecting me to know all about Babylonian fertility rites and shaming me when i didn’t. Does Neverwhere have the same style?