One of our recent guests couldn't stop talking about how lovely and cozy our home smelled and that she never wanted to leave! I simply put some wax tarts (unmelted) throughout the house; tucked them into baskets, floral arrangements, a dish of seashells, on a shelf and the back of my towel cabinet. Each room smelled wonderful without having to worry about lighting candles or spraying room sprays each day. I used the same fragrance throughout and made sure that I picked something that wasn't irritating such as a floral. Many people can't smell floral scents without going into an allergy attack so I stuck with a soft vanilla-based cinnamon fragrance. You can pretty much not go wrong with Vanillas either.
Clear a Path
De-clutter the entry area so there's room for you and your guests to greet each other and bring in suitcases without tripping over shoes, book bags, or awkwardly placed furniture. A front entry needs enough furnishings to provide a sense of transition -- a table with a piece of art, for example, acts as both a focal point in this entry and a visual connection to the living room beyond. The front entrance is the formal one that guests use, while the family entrance may be on the side of the house, through the garage, or at the back door. You don't need the same kind of functional storage here that you do at those entrances, so the furnishings can be minimal and decorative.
Keep the Decorating Simple - Avoid over decorating the guest bedroom. You want it to be comfortable and welcoming but not so full of decorative objects and furniture that guests have no place to put their things. Leave room to make this their home for the duration of their stay. If you have only one guest room, choose twin beds over a double or queen-size bed; that way friends, children, or couples can occupy the room comfortably. A shared table serves both beds as a place for an alarm clock and personal items.
A Place to Unpack ~ Guests will greatly appreciate having a flat surface to rest their suitcases for unpacking -- here a woven hamper holds extra blankets but can also support a suitcase. An ottoman doubles as a surface for resting a carry-on bag. Clear tabletops and dresser tops, too, so your guests have a place to put their reading material, toiletries, and belongings.
Make Space in the Closet ~ Even if the guest bedroom closet normally serves as your out-of-season storage, move the clothes elsewhere for the duration of the visit, or at least push them to one side to make space for your guests' clothes. Provide plenty of hangers for skirts and pants as well as shirts and blouses. And if you have clean, fluffy robes available for your guests to use, you get five stars as a host/hostess.
Provide Bedside Lighting ~ While bedside lamps are essential for safety reasons (if a guest needs to get up in the night, you don't want him to have to stumble to the door in the dark), wall-mount lamps offer added convenience and comfort. Install one over each bed, high enough to illuminate the headboard and pillow area for bedtime reading but low enough that the lamp can be switched on or off easily. The right height will depend on the height of the bed.
Provide Privacy with Window Treatments ~ While you may have a bare-windows policy for the rest of your house, dress the windows in the guest room so that guests have the option of covering them for privacy or blocking light if they wish. The combination of woven blinds and fabric draperies here allows guests to lower the blinds in the daytime to filter light and block views. At night, they can draw the draperies for greater privacy.
Some other useful articles: Make Overnight Guests Feel Welcome in Your Home and Holidays: When Guest Come A Callin'