Of course the first thing I thought about was Casa da Papel - I have to say I really loved it but we all have different tastes, right I don’t really watch movies to learn Spanish, because I never really have that much time, but here are some other ideas.
A good place for free series is rtve.es I watched a series there called ‘Misterios de Laura’. It’s a Spanisch series about a divorced detective - Laura - with twins who has a good looking sidekick (eye candy for us ladies) and as the name implies, she solves mysteries. Subtitles are available, at least in Spanish.
Something else I enjoy - from the learners point of view - is ‘Ahora Caigo’. It’s a game show, something I would never watch in English or German. It’s terribly loud and silly, but great to learn new phrases or vocab. I use atresplayer.com - also a great resource for all kinds of Spanish series, games shows, etc… and subtitles are available.