Closest book I've found to Piranesi is Edward Carey's The Swallowed Man. I reviewed it here.I finished Piranesi over the weekend. Loved it. What a book!
Today on lunch I picked up The Ladies of Grace Adieu and while I don't remember very many details of JS&MN and feel like I'll probably miss a lot of references or whatnot, hopefully that won't be a huge detriment to the stories.
I just published a review of A River Called Time. I didn't like it.