I need a nice house plant that will make a room smell better.

Without a doubt the nicest smelling house plant that I have ever experienced is Boronia.

Lavender isnt really a house plant per se but it can be and will smell great. A tropical hanging plant will also work well in recycling the air and addind humidity and all that good stuff.

Plants in general help purify the air. But unfortunately, most house plants (or those better suited to low light) don’t really have a strong scent. Seeing as my own bedroom has turned into a greenhouse as I can’t plant much outside as I live in a desert. I can tell you that the air in my room smells the best—cleaner—but it’s also mighty humid. I say if you really want a distinct smell, use perfumes oils or a candle but putting a plant or two inside is always a good idea.