They are really safer than a lot of "undesirable neighbourhoods" in other western European nations, but be with your guards at nighttime. Most destinations nearby of metro stations are safe. Pickpockets are rife about the metro, and travellers need to take correct safeguards. Announcements in Metro trains and stations https://tarot-del-amor59367.tinyblogging.com/helping-the-others-realize-the-advantages-of-madrid-70517021