Testaccio is generally a safe neighborhood both day and night, offering an authentic Roman atmosphere and local markets. However, like any urban area, remain vigilant, particularly in crowded spaces where pickpockets may operate. Be cautious around more secluded streets at night and always keep an eye on your belongings. Common scams may include overly aggressive street performers or vendors, so it's best to stay polite but firm in such situations. For solo travelers, consider joining local food tours or group activities to connect with others while enjoying the culinary scene.