Lovely little museum, situated in beautiful quiet gardens. Only small, but there are a few other museums in the same area that i believe are ran by the same people that you can buy tickets for at a very reasonable price (we also visited the anthropology, zoology and physics museum that are all in the same building a 5 minute walk away at the same time)
The vast majority of the information at all the museums is in italian, but there is lots to look at and there are some english information books in some of the museums. It was very quiet when we visited (an hour or so before close) and it was nice to find a bit of calm in the city, particularly sitting in the gardens just before we left.
Altogether definitely recommended, however these museums do not contain things like interactive activities etc. so bear that in mind