In the house lived Gaudi with his family between the years 1906 - 1929. The house overlooks Park Güell, probably the most well-known and popular work by Gaudi. The house is actually right inside the park, at the heart of a green area full of trees.
In an exhibit shown at the museum, you can see the everyday life of Gaudi, as well as rooms, personal items, and furniture, that were an inseparable part of the original house. The museum also shows Gaudi's work as a designer, for if you though his strong suit was large and impressive buildings, you can see different art pieces he created - interesting chairs, metal gates, statues, and more.
There is a reason it is so interesting to wander around this museum. It is interesting and fascinating to discover where Gaudi sought inspiration for his buildings from, how he lived, and what interested the genius.