Well, I'm no expert on home fragrance, but if I had to guess the three ingredients that make a house smell good, I'd say it's all about the balance of fresh, natural scents. Firstly, I'd imagine a good air purifier or diffuser filled with essential oils like lavender or peppermint. These natural oils not only freshen the air but also have calming effects on the mind. Secondly, I'd say a clean and organized space is key. Regular cleaning with natural cleaning products can eliminate musty or stale smells and create a fresh, inviting atmosphere. Lastly, I'd add some live plants or flowers to the mix. Not only do they add a pop of color and life to your space, but they also release oxygen and purify the air, contributing to that alluring aroma. So, in summary, essential oils, cleanliness, and natural greenery - those are the three ingredients I'd wager make a house smell good. What do you think?