We just got back from a trip to the Dolphin. We had room 7019, in the far east wing. 2 beds, non-smoking, but no balcony. However, a fantastic view of Illuminations, Epcot Ball, Boardwalk, etc.
Our stay at the Dolphin was fantastic. We liked the Epcot resorts area so much, we are now considering buying into the Beach Club Villas of the Disney Vacation Club.
You can read more about my Dolphin stay on this thread (along with some tips for those staying at the Dolphin):
This room didn't have a balcony, but you might want to consider it for the view. It's featured on our website under the Dolphin section and is room: 16109. Yes, that's a 16th floor room so the view is spectacular. The elevators are VERY fast too.
We had a balcony room in February, #6025. This was our view!
We watched the fireworks from Illuminations every single night, and could hear the music from the Tapestry of Dreams parade! It was the best trip yet to WDW, and I think the location of our room had a lot to do with it!