My wife and I recently spent three lovely nights at the Architects Inn. October is off season but perhaps the best time to visit Newport. Still enough going on, weather is decent and getting around and parking is easy. The Rosewood Room we stayed in was certainly spacious enough and nicely furnished. Bathroom was large and claw foot tub was interesting albeit a bit hard to navigate into and out of.
The Inn is in a great location. A 10 minute walk in one direction takes you to a cluster of restaurants on Broadway like the Fifth Element, Salvation Cafe (both great), Noreys, and Tuckers. A five minute walk in the other direction takes you to the Art Museum and Rosewood Library, and the waterfront area is within a fifteen minute walk if you don't want to drive.
Brian and Nick were great. Didn't see them much during the stay but they made us outstanding breakfasts and spent time chatting with us during and after the meal. Both were friendly, very open and fun to talk to, and in very short time "zeroed in" to what kind of people we were. When we queried them about the mansions and told them two or three max, they gave us an overview of each and suggested which ones we might be enjoy. When we asked about dining they suggested the kinds of spot we liked, unpretentious, and casual but good food. Try Scales and Shells for fresh seafood and Brick Alley and Red Parrot for almost gourmet bar food.
I forgot some files at the Inn upon our departure. Within an hour I received a text from Nick letting me know and he mailed the files to my office. What a life saver that was. Would definitely return to this place as everything about it just made our trip all that much better.
One final note: Brian and Nick are busy guys as they also run another B&B and have a restaurant. So at least in the off season a lot of communication is done by text messaging. This actually pleased us because it rendered them unobtrusive but they always responded quickly. But technically challenged types might not appreciate not having someone around the Inn during large parts of the day. I understand that during the season there are more staff around.