We stayed in March for a week in Guido's apartment. Apartment is very cozy and beautiful, you can find all tips you can find (maps, taxi prices, guides, Infos - everything is on a wall in living room), metro Piazza Cavour is just 5-10 minutes walk, big station Garibaldi (to Vezuvio and Pompei) in 15-20 minutes walk or you can go from Cavour just one station more. Area is quite as for me, safe (better than directly near piazza garibaldi centre). There are many markets nearby. Good apartment to stay if you don't want to live in noisy place with clubs and bars or higher crime rate and want to have main metro, bus and train stations nearby