I use Melo and Sons Upholstery in Somerville. They are more than competent and reasonably priced (though not inexpensive). I have used them for years on everything from sofas, chairs, sleepers, dining room chairs. The workmanship is top notch (for example, self fabric pipings and cordings and trims are carefully made and evenly applied;patterns and repeats are carefully matched).And everyone that you deal with is very nice.