In my culture It'd be the other way around. Perfume could be romantic or mean 'you smell'. Chocolade, self-made cake of muffins would be alright. Or something individual, a drawing if you can do it, a nice 3d print or whatever creative hobbies you have. Yeah and somebody said a book. Lots of teachers like to read, and you know what stuff they're interested in... It's probably what they chose to teach. Or just say thank you, you helped me a lot and influenced my life for the better.... You could also instead write it down on a nice card.

Coffee or tea

Why not go with the classic: An apple.

Don't overthink it. A good rule of thumb, for teacher presents, are something to keep, and something to use up.

Something to use up is obvious and fairly easy. Chocolates etc work, as does wine, or bath "pampering" sets. The main thing is that they get used up and go away afterwards. Avoid excessive clutter, teachers can get a lot of it.

Something to keep is harder. You want to avoid generic clutter. Whatever it is should either be legitimately useful, or small and simple to store away. An honest, and earnest note works very well, maybe a smaller card. If you have the skills/equipment there are a few other options. E.g. I made customised slate costers for my daughter's teachers, when she left nursery. They had the teachers face on them, with a thank you message on the back. The key was they would be legitimately useful. Keeping track of mugs is always a fun game, particularly in a teaching environment. They also didn't have the nursery name on them, so they could be taken with them, if/when they changed jobs.

In short though, don't worry. It will be taken in the vain you offer it in. Inspiring that response in a student is likely one of the things they love about teaching.

flowers

Chocolate is better than perfume for sure! But personally, I feel that it really doesn't matter. It's more about the way you give it and what you say /write along with the gift. Not knowing about anything that had gone on, I wouldn't be worried about it being misunderstood

Liquor