A murphy bed, otherwise known as a wall bed, pulls down from the wall on a spring mechanism when it is being used and during the day is pushed back up flat against the wall. It comes in a variety of cabinet styles, so it just looks like a large armoire or closet when it is put away. It is about ten times more comfortable than a hide-a-bed or sofa-sleeper!
A friend of mine bought one in Denver at http://www.smartspaces.com/ and it looks great. If your Summit County condo is squeezed for space (and whose isn’t?) consider this option if you need sleeping space for two extra people. It does take up a good bit of wall space, but little extra floor space except when it is pulled down on the nights it is in use.