While we were in Barcelona on holiday, we had an awful experience.
We went to the beach and my friend forgot to close all the windows in our room. We didn’t care that much since we taught nothing will happen. But when we returned we saw that our room wasn’t the way we left it.
They have stolen my friend’s laptop and around 100 euros. Luckily most of our money was in the safe so they couldn’t take everything.
My advice is to close everything and keep anything valuable in a safe. You never know what can happen while you are resting at the beach…