Agreed! We went last year and thoroughly enjoyed it. I understand that the Long Room in the Old Library is mostly empty for renovations, but the Book has been moved to a dedicated building during this time.

Pro-tip to any potential visitors: they turn the pages every so often, and I have heard some travel bloggers complain that the pages on display when they went weren't very interesting, but the university will show you what pages of the book of Kells are currently on display: https://www.visittrinity.ie/book-of-kells-pages-on-display/

At the moment, it appears that they have it open to a pair of canon tables which have some really lovely illuminations.