As someone who doesn't use these, the first things I think when I enter a home with them are:
- This smells nauseatingly, overwhelmingly artificial.
- This can't be healthy (spoiler: correct).
- I wonder what they're masking to want to spend money on these things.
- I would prefer to be outside right now.
OP, as the other comment said, keeping a relatively neutral smell hopefully is a good goal and then maybe add pleasant undertones later. Instead of trying to introduce positive smells (cook at home more often or grow some plants, and you'll get a bit of that!):
- Make sure dirty laundry is kept in a hamper with a lid and washed at regular intervals.
- If you have pets, make sure they're housetrained and that accidents are cleaned – preferably with an enzymatic cleaner. Bathe your pets regularly too. If you have small animals in an enclosure, keep that clean.
- Shower regularly, and clean your bedsheets regularly.
- Make sure the house isn't excessively humid.
- Vacuum at least periodically.
- Make sure dirty dishes don't just sit dirty out in the open for long periods.
- Make sure smelly garbage has a lid over it and is taken out routinely, especially if there's stuff like meat scraps in it.
- Open the windows on nice days when it's around room temperature.
- If it's especially bad for some reason, an air purifier may help.
- Regularly clean your bathroom.
- Keep your fridge organized so food is less likely to go bad (or bad food gets caught quickly).
- If you have a shoe rack near the door and you want to be really extra, you can once in a while deodorize your shoes. Maybe I'm a freak that I don't do this.
- Make sure the house isn't excessively cluttered.
This isn't all-or-nothing: any of these will help with the odor, and that's the goal.