A piece of old world NY ..but in Boston
What one thinks of the Omni will largely depend on your mood. Trouble for me is that Boston is too nice a place to put me in the mood for the Omni ! The Omni Parker House is lifted straight from midtown New York ....locked somewhere in between the 1930's and 1950's ...with austere and dark large reception hall. Now some will just love this ...it's in the Waldorf style ..big old lifts with those clock faces above the lifts that have a long hand counting down the floors. You sort of suspect that this place will serve a very good nice cream tea !
Now don't get me wrong ....the beds were comfortable and rooms although on small side were fine. Bathroom cramped as usual and like many US hotels from this era ...in desperate need of some more modern sanitary ware. But I was perfectly comfortable in my room. 
Maybe 3 stars is a little harsh. For those who like this sort of thing ...it's probably worth at least one more BUT ....whilst somewhere near park and 5th in New York with the plentiful covered awnings spilling on to the pavements this sort of place works....Boston is an altogether more civilised and well presented place and somehow I want something either dead contemporary or something like a townhouse of which there are many fine examples. 
Bottom line: fine of business, full of history, comfortable but lacking charm and character. Would not want a romantic weekend here.