One of my go-to's in Pittsburgh! I first dined at Habitat shortly after it opened and have returned twice for special occasions. (Mother's Day and gf's birthday). Habitat is intimately tucked into the 2nd floor of the impressive new Fairmont Hotel in downtown. The main dining room is both chic yet fairly spartan in design, allowing attention to be drawn to the busy but immaculate open kitchen.
The menu items change less frequently than I would like, but it doesn't really matter because I was able to go for the pork belly app a 2nd time! (It's no longer on the menu I believe) The chef's use of quality ingredients in creative ways is perfectly executed. I prefer good food to speak for itself, and nothing that I have tasted was muted by over preparation or seasoning.
Then the staff. In three visits, the GM Alan recognizes me on the phone and heartily greats me at the table. He poured free champagne for my gfs birthday party as well, a nice and appreciated touch. The servers are knowledgeable and friendly, without being overbearing.
In a handful of very well done restaurants in the Pittsburgh area, Habitat holds it's own. As in another comment, ship the valet and park yourself to save an outrageous valet charge. And go, seriously. Go check it out, you can thank me later.