A good reason for visiting Rome in January and February is shopping. The italian sales are very interesting because you can get good quality at reasonable prices. It is always better to focus on good brands and classical items to be sure to wear them again next winter. The streets for shopping are via Frattina, via di Campo Marzio e via Borgognona. Especially for shoes and coats. I suggest also to go to Gente, the best boutique in Rome, in via del Babuino.