Uber, Lyft, T all good. I would probably take Uber or Lyft because you get picked up right out front no walking to the T no maps to follow etc
Uber or Lyft is likely the most convenient. U may want to walk the final few hundred yards.
Public transportation is great in Boston
You would have to take the Red Line to Park Street (a few stops towards Alewife). Get off the Red Line and either take the Green Line C outbound to Kenmore, or the Green Line D outbound to Fenway.
I would do Uber or Lyft.
Walking... It's 20 minutes from most of Boston
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