You may wish to consider some of the managed luxury rental complexes in the downtown area of Stamford such as: Avalon Greyrock, Parc Grove, Morgan Manor, or Glenview House. They sometimes offer 6 month leases but you will usually pay a bit more per month than if you were to sign a yearly lease.
I suggest "googling" them to find out more information about pricing, availability, and the amenities they offer.
Good luck to you!
Prudential Connecticut Realty