The entire experience from parking signage, street valet, check in, committed room availability, room cleanliness, quality of food, service staff knowledge, and amenities are two and a half star quality at best.
As a private equity investor who spends 80+% time on the road in five star hotels around the world, I've seen the most accomplished of hotelier operations in The Ritz Carlton, The Four Seasons, and even The Park Hyatt. I've also see hundreds of failed as failing businesses in need of capital, strategy, and/or improved management. This hotel has a great history and even greater potential, but, regretfully, utterly fails in execution.
At this hotel, you will have to wait and when a time is committed be it will be missed. This is consistent from the amount of time the valet (who is also the concierge and the bellman) requires to get back to the concierge desk in order to take your keys after you self park your car on the street to the room that should be ready in 20 minutes still unavailable after 90 minutes of waiting after check-in.
Overall, the staff is young and seem to genuinely want to do a good job, but have not been properly trained on the contents of the food and drink menu or general best-in-class service protocol. You will wait too long for service in the restaurant only to find a server who needs to ask her manager everything (including how to handle the coffee machine being broken during breakfast). In The Bar, I had a waiter insist that the Bailey's and Coffee was indeed the Negroni that I ordered. Only after my insistence he check with the bartender did he return conceding he delivered the wrong drink (a hot coffee and cream in mug versus iced bitters in a rocks glass).
The hotel room was sufficient, but there were only two pillows on the bed, no duvet, and the non-slip film on the shower was coming off in huge strips (even after two days of cleaning where the room attendants failed to call engineering to remedy it).
Hopefully there will be a management, cultural, and general resource paradigm change before the plight of its current management approach drives The Fitzwilliam into the mediocrity of a prior greatness squandered into present-day obscurity.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.