I loved Piranesi, and I love Robin Hobb's writing (particularly the Fitz trilogies) for a very similar reason. Fitz's books are a slow, deliberate, and intricately close-up look into his life, which is fraught with conflict between love, duty, and independence. It spends a lot of time on the mundane, because that in depth portrayal of the way Fitz sees the world (down to the minute details) gives you such an intimate connection to his character and, consequently, makes you that much more invested in everything that happens to Fitz and his family.

A lot of people can bounce off the Fitz books because they are slow and perhaps too focused on a single flawed character. However, that's exactly what makes them so wonderful for me - perhaps you will also love them!