Student housing in Madrid is generally safe, especially in well-maintained residences and reputable rental properties. Most student residences have security features such as keycard access, surveillance cameras, and on-site staff. It's advisable to choose accommodations in safe neighborhoods and avoid areas with higher crime rates. Always research the safety measures provided by the accommodation and read reviews from current or past residents. Additionally, practicing personal safety habits, like locking doors and windows and being cautious with belongings, can further enhance your safety.