I have never seen a Starbucks which is crowded, every fuckin time! Yes, I am talking about Harvard square Starbucks, and yet do not be confused because there are 3 Starbucks in that location. This is the corner one, next to Red Line entrance. A lot people use this Red line in weekdays as it has a connection to Downtown area and Green Line through Park street. The sketch was from where inbound and outbound separates. The underground of Harvard Square homes to busses, too. You can take 5 or 6 bus line. I sketched at home from a picture as you cannot stand 30 minutes in rush area.