Two best ways to get to Friendship Heights:

• Take GUTS to Dupont, take metro from Dupont (Redline) to Friendship Heights station (for Cheesecake factory: when you exit the metro, go up the stairs to the mall-you'll actually be in the mall where the restaurant is)

• Take any of the 30 buses heading up Wisconsin Ave. away from M. St.and get off when you see the restaurant or Gallerie

• Both cost 1.20 each way for metrotrain and metrobus

Mazza Gallerie
This mall is an upscale shopping mall at Friendship Heights.. Mostly more expensive stores (Williams and Sonoma, Neiman Marcus, etc.,), but also has movie theater. It is right down the street from cheesecake, so you get there the same way.
Store Hours Monday - Friday: 10am-8pm Saturday: 10am-7pm Sunday: 12pm-5pm
List of Stores http://www.mazzagallerie.net/store_list.php3

Cheesecake Factory
Average cost of meal at Cheesecake Factory (entree + dessert)=$15-25
Website: http://www.thecheesecakefactory.com/locations.htm and then just choose DC location
Hours Monday - Thursday 11:30 am - 11:30 pm; Friday & Saturday 11:30 am - 12:30 am; Sunday 10:00 am - 11:00 pm