It seems a bit last minute to be trying to make a reservation for Valentine's Day only a week in advance. Also it's a hard question to answer without knowing what your price range is -- some high end Italian restaurants with fresh pasta can be very expensive.
Intimate birthday dinner under $50/pp (incl. tax+tip) downtown w/ fresh pasta
Best pasta in nyc?
Time for a pasta binge - who's the best?
Good luck, 2/14 is a hard night to reserve!