First off, you can only get one of the two, and it depends on who you help in megaton. In the center of town, there is an active nuke, and a man in town (Mr. Burk) wants to detonate it. If you help help, you get the suite, but the town and everybody in it dies. If you shut the bomb down, you get a small house, but its smaller and not as nice. So if you are good, take the house, evil people get the penthouse.