Sometimes the practical thing to do is to put a pair of twin beds in a single guest room as opposed to one larger bed, in order to maximize the number of people who can sleep in a home. But the nature of smaller-sized beds can give a kiddy vibe to the space because we are so used to seeing them in children's bedrooms.
Thankfully, we have discovered several ways in which to give some age and wisdom to these types of designs. When creating a sophisticated bedroom to contain a pair of twin beds, it's important to choose colors that one isn't used to seeing in a kids room. This will immediately alert the eye to the fact that something is different than expected in the space. Elegant textures, patterns, and art will also help to make the statement.
If you can arrange the room so that the two beds can be pushed together, they can have the added function of sleeping two guests separately but provide a wide canvas to decorate in an adult manner as you would any other bedroom. Upholstered headboards in luxurious fabrics are an immediately mature touch in a space. And finally, if all else fails, some over-the-top luxury has a distinct way of declaring "no kids allowed."