It just depends on what time of day and what the occasion is.
I tend to use citrus oils(grapefruit/lemon/lime) during the day as they are uplifting and refreshing; bergamot is an excellent anti-depressant so helps when you are doing the mundane chores of tidying the house especially when visitors are calling !
For the evening geranium/lavender/rose/ylang ylang all are excellent relaxing oils and will put guests at ease.
If you want to create a vanilla aroma which is very popular then use black pepper combined with ylang ylang or try benzoin oil which is quite musky.
For festive and winter times cinnamon,juniper,frankincense and orange/ rosemary,basil, eucalyptus and peppermint (helps with prevention colds).
If it's for a sensual evening try aphrodisiac oils of neroli (petigraine is a cheaper option here)jasmine(very expensive) or ylang ylang.
It's great to experiment with a combination of 2 or three pure essential oils,you can also spray the curtains/cushions and bed sheets with them using a dilution of 10 drops to 100ml of water then shake well before using.(use an empty clean spray container for this :)