We have a flight coming in at 10pm on Monday. Transportation information I've been able to find on MBTA has us taking the Silver Line to So. Sta. and then the Red Line to Charles/MGH Station. Then walking "13 min." to the John Jeffries on David G Mugar Way. We'd be doing this just before midnight and I'm wondering if it's OK to be walking about pulling our bags at that time of night? If that's not a good idea, any idea how much a cab would cost? What part of town would this area be called... Beacon Hill?