The Ritz Carlton Pentagon City is first-rate in terms of service and comfort. While staying there during a business conference my roommate and I found a few quirks which, while they didn't ruin the experience, were disappointing considering it was a Ritz Carlton. The room itself was plush and well appointed with lots of fluffy pillows, beautiful curtains and furnishings, and perfectly comfortable beds. The bathrooms, while marble clad, were very much lacking. The fact that there was no exhaust fan left the room all but impossible to properly dry and style one's hair without waiting an hour or so for the humidity to dissipate. In addition to the lack of ventilation, the lighting in the bathroom had an awful yellow cast to it and was too low for applying makeup.
The service staff was friendly, accommodating, and very quick in spite of having a house full of potentially demanding guests.
The view from our room wasn't great but considering we never left the building in 3 days (and never had to with the connected shopping mall) that wasn't as much of a factor. We also never had a chance to avail ourselves of the metro stop literally right outside the door either.
As a bonus, having the connected mall was brilliant for my roommate and I as we preferred to breakfast more economically at the Au Bon Pain at the mall instead of the Ritz Carlton.