Igor N.
Google
The museum is pretty small and not so rich as in other european big cities, but all exhibits are intetesting, and there are many VR and touch screen game stops. I went there with 9-years old boy, and was surprised to discover ať the end that 1.5 hours just flew.
Cheap tickets (3 euro), no crowd, toilets and benches on every floor, very nice historical building, excellent location (near Plaza de Espania) - 15 min walk from center.
We didn't go to Planetárium (3 euro) as next show was ať 18:00 and we were there around 14:00. So, i would recommed to call in advance and check show times. Probably it requires dark hours.