If you are visiting the Gardiner Museum, I recommend stoping by the library in the basement. It if a great way to visit the behind the scenes of the institution. Plus, you get to look through their increbible collection of ceramic-related material. However, being in the basement, there is no light, which is not my favourite to study.
Hidden. Explore behind the scenes of the museum.
Open only on certain days or with request to access. In a basement.
* The rating, out of 5, is subjective based on criteria such as variety of study spots, outlets, aesthetic of the space, etc.