Asking Feng Shui Master, is it okay to put lavender on the bedside?

No problem, put lavender on the bedside. If it affects the relationship between husband and wife, it depends on what kind of flowers you put. For example, roses and lilies are good, but don’t put flowers that are too unusual. You like it, but she may not like it. This is not Feng Shui, and small conflicts may also cause disharmony. If you are afraid of windows, hang a curtain, it depends on what color you like. Hope this helps.