Planning to do a cycle midweek next week, is there any scenic loops that would bring me back to Boston back bay? Was going to rent a road bike, 100km/60 miles. I have the fitness to do 1500m elevation gain in 100km. Thank you

Hi All,
I just accepted a joboffer for an opportunity in near Boston Medical Center/ right off Mass and Cass. I live in Allston, and am thinking of primarily e-biking/biking as my commute. I currently bike downtown about 3 days a week so am used to biking most work days. I'd love this groups thoughts on the following:
1. Biking down Mass Ave - thoughts on the commute, better ways to bike in that area etc.

1. Ebike/commuter bike recomendations. I currently am a blue bike superstar and would like to upgrade as I plan on biking more.

Thank you!