I think you need to try the newly remodeled PH DC!

Of course, the Grand DC is very convenient, it's right on top of a Metro station. The problem is that I don't find it very romantic or that nice. The RC is open on the weekends though and they were busy with tourists when we've been there. We've always been upgraded to the RC even when visiting on PL rates. Parking is a problem, as sometimes even the valet parking gets full.

Suite upgrades are the Park DC were very easy to get for Diamonds, and even the old bathrooms were much nicer than the Grand. Melrose restaurant was very good, but a little too formal for our touristy weekend. Lots of people in evening gowns and formal wear. It is much more upscale for breakfast than anything at the Grand. Not sure what the new restaurant is like.

The big drawback for us as tourists at the PH, is that you'll be walking several blocks to the metro, or taking cabs to go sightseeing. As you know, it's very hot and humid in the summer there.