Just a few brief thoughts.
The book is very well written and I think the author did an excellent job of portraying Nell's life in a very vivid and readable fashion. The Restoration theatre world was fascinating and the secondary characters, particularly libertines Rochester and Buckingham were colorful and realistic.
The ending chapters perhaps left me a bit cold - likely I found all the death depressing. I also wished for a bit more character development on Charles' part as I didn't feel Nell's love for the king near as markedly as I felt it for the actor Charles Hart (I thought the death scene with the king was a bit anti-climactic.)
Although there was a bit of shock value to the early part of this book (graphic sexual encounters to include a menage), I had no real problem with it because of who the character really was - a woman who rose from the gutter.
Overall a VERY good read and highly recommended for fellow Restoration lovers.