We stayed in a two bedroom presidential unit (10th floor) for 5 nights starting June 19, 2011. Room was absolutely OUTSTANDING! Absolutely gorgeous in every way, great kitchen and appliances, beautiful flooring, spacious rooms, full laundry room (presidential units only, standard rooms have access to shared laundry on each floor), beautiful and spacious bathrooms and a huge hot tub in master. The only down-sides to the room - both bathrooms had a fan that ran non-stop with no on/off capability, slightly annoying, and we had a small issue with some spiders on master bedroom ceiling and out on the rooms patio area.
Like many of the other reviews - the pool was a bit of a disappointment being too small for the size of resort. Too bad they didn't do a green roof-top and pool as the views and space available would be absolutely incredible! The hot tub in the pool area was nice though and there was an outdoor grilling/kitchen area by the pool which was very nice! Kids enjoyed the Wii room and did a couple of the kids activities.
DC Access - we used the bus and metro extensively for the three days that we travelled down to DC. Bus picks up just around the corner from the resort every 30 minutes and is $1.70/person/trip, bus takes you to the Metro Rail Branch Avenue station which is part of the start/end of the Green Line for the Metro Rail system. Metro Rail pricing is a confusion and different story of its own, but in short we chose the simple route since were using the rail multiple times to get around and bought the full day passes which are $9/person/day. Round trip to DC adds up quickly this way at $12.40/person/day but definitely beats driving down there and dealing with parking hassles which we had attempted once (and never again - yikes!) - plan about an hour for public transportation travel to get to/from DC each way. After a day of hopping the bus and rail, we felt pretty comfortable hopping the Metro Rail and transferring trains, but in retrospect and reading some of the other reviews, probably would have been better off taking one of the tour bus options picking up from the resort and getting around that way. If you are travelling to National Harbor and planning to stay within the NH or travel to Alexandria or DC area, do yourself a favor and skip the car and use the public transportation options. SuperShuttle services will get you to/from the resort and the airport fairly conveniently too. Parking (if you choose to use a car) - is $10/day in an in/out ramp about 2 blocks from the resort, $20/day for valet parking (in/out), or $11/day max (no in/out use, must pay each time) just across the street from the resort entrance)
The National Harbor area is outright beautiful! Well maintained, well designed and laid out, with nice restaurants and stores all around. There is a beautiful Potomac River walk that is a bit over a mile in total length (end to end/2 mile round trip) just 2 blocks out from the resort and makes for a beautiful sunset walk! There isn't currently any full grocery store in walking distance of NH, but between the CVS below the Wyndham and a Market store across the street, there's adequate food selection to stock the units' full kitchen. We ate at the Cadillac Ranch and Pot Belly restaurants a couple times, both good options with reasonable prices, Cadillac Ranch gives a 20% food discount to people staying at the Wyndham.
Overall, a great resort and great stay, but if you are planning on going to DC a lot may try another resort. Wyndham National Harbor would be an absolutely phenomenal option for a couples stay if you are planning to do some relaxing and just a little DC time though. Good option for families too, but plan ahead on the DC transportation.