Fine but boring
I recently stayed at the Westin City Centre for 3 nights on business to Washington DC. I found the location to be pretty good (everything downtown is basically walking distance), but the hotel itself is pretty boring. There is almost no action in the lobby, no common space with a good vibe.
Most of the rooms at this hotel are pretty standard, so, a platinum upgrade landed me basically the same room as everyone else. That means an interior, atrium view. At least I was high enough that the sunlight came through the skylight, but I'd rather not face other people's rooms across the atrium. The room is pretty basic Westin, not terrible updated or upgraded, and the bathroom was a standard shower/bath combo. Not my favourite.
Also, no club lounge, so no free breakfast or hors d'ouvres. 
In the end, too many great hotels in D.C. to stay at this one again. I'll try another. The W looked awesome...