Last winter we used the Townhouse it is on 20th street, ocean side and close to the MCB studios not quite as close as the Abbey but almost. One of those boutique, minimal places but we liked it. Got a good rate on line too. We stayed at the Abbey too and were happy with it, but perfered the Townhouse. It is a little quieter at that northern end of South Beach but closer to the action than say the Fountainbleu. You are also close enough to where they perform to walk there also. Of course having a car there is a pain, most don't have parking but might offer valet. And the street is like 50 cents an hour or half hour 24 hours a day in many places.
Of course I keep telling everyone come to Naples to see them, they have a "live" symphony and it is a beautiful theatre with no bad seats. You can find a link for the Naples Philharmonic on the MCB site I believe. They will do most of the same programs 2 nights each in January, Febuary and March. They do Nut at Thanksgiving and usually something in December but don't know this year.
It is only 2 hours or less from Miami to Naples on the west coast just across Alligator Alley. Talk about quiet but beautiful and affordable and close enough to combine with a livier trip on the East coast.
No I don't work for the tourist counsel or even in Naples but I go to see Miami there all the time.