There are few, if any, VLW-friendly (or vintage bicycle friendly) I can think of here in Miami - the ones that appriciate them don't usually do the best repairs, and the ones that will do good VLW repairs are a$$holes.
The two that make the grade are the following:
Tamiami Cyclery on 6348 SW 8th St. West Miami FL 33144. Good repairs, VLW friendly, but a bit cramped on space. Fellow has some vintage parts, but not much. Orlando, the owner and sole employee is friendly and easy to work with.
Bike Tech on 2220 Sw 22 Ave, Miami, FL 33145 - also good repairs, but the quality of service depends on the associate you speak with - store manager Marcelo is best, as he has an appriciation for VLWs, unlike some of the other robots on the floor. VLW parts are 'across the street' as well (you'll understand if you were standing on the sidewalk in front of this Bike Tech), but are not worth your effort (if you get what I mean).
-Kurt
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