The Plaza is great. We stayed there on points a couple years ago. The room was quite small compared to what you're used to with DVC properties, but you have to expect that from a hotel room, especially in a beautiful old hotel like this.
The room was quite beautiful, however, an antique in itself. Crystal chandelier, amazing woodwork, wonderful king size bed and a great view of Central Park. The staff were wonderful and you really get the feeling of "old time" NYC. You also can't beat the location, right across the street from the park.
We also stayed at Charleston Place in South Carolina. We got upgraded to concierge level and had a great time. Again, the staff were wonderful and we felt very comfortable. The room was very nice, although not as beautiful as the Plaza room. The pool and hot tub were great- the roof over the pool opens when the weather is nice and the whole area is very peaceful. The restaurant there (can't remember the name) was first rate, at least as good as any of the top restaurants at WDW.