We stayed at the Onyx twice in a fortnight at each end of a tour of New England, having stayed at Kimpton hotels before. These stays were as expected, nice room and very good service from all the staff we encountered. Location is fantastic for the centre of Boston either if you want to walk or get a cab.
Couldn't fault any of the services provided, very clean and well equipped and enjoyed the wine & beer hour which is a chance to chat to those who gather informally in the lobby each evening.
Would certainly return when in Boston.

Four of us stayed at the Onyx the night of the NBA Finals in the penthouse. We believe the Onyx, the Onyx staff and the Celtics to be winners.

Onyx staff emailed us before our arrival and asked if we had any requests for our visit. I emailed them a short list, including a couple specific items. Upon our arrival, waiting in our rooms were the exact items on our list.

Everyone from the parking attendant to front desk staff greeted us as old friends, even though it was our first visit to Boston.

Our rooms were immaculate and with four of us in the penthouse, we each had our own bathroom. Each exceptionally clean and well stocked with quality products.

Many things are within close walking distance of the Onyx, such as the subway, restaurants, shopping and of course the Garden. it doesn't get much more convenient.

We were driving a slightly unusual vehicle that created a minor problem for parking, but Onyx staff managed to park it safely away for the evening without complaint and made special arrangements for our late departure the next day.

Security was not a concern the night of the NBA final, as the Onyx staff had prepared a letter of procedures hotel staff would follow and hotel guests could follow for festivities after the game. We felt at ease and secure during our visit.

We watched the game from our living/office area of the penthouse and enjoyed the wet bar facilities and the large TV.

Did I mention we had a great nights sleep, well we did as the beds are great.

We would enjoy returning and recommend a visit to the Onyx to anyone.

Stayed one night. Found the hotel typical of Kimptons hotels, meaning very nice. Something I wish I knew about before I booked is that they have kayaks and bicycles for use by guests. Close to subway.

Found the restaurant food alright, service was good.

As a 1st time visitor to Boston, the Onyx was a great place to stay. The staff were extremely friendly and helpful. The rooms were clean and nicely furnished. The linens and towels were soft and comfortable (which is not a common occurrence in most other hotels). The wine/beer hour was a nice treat at the end of a long sightseeing day. A couple of nice pubs only a few doors down and a 7-11 just around the corner for those who don't care to eat/drink in the hotel restaurant/bar.

Only one or two negatives - the surrounding neighborhood is a bit run down with many empty storefronts, etc., and there could have been a better variety of channels on the television (but this is a minor thing).

Overall, I would highly recommend this hotel.