your space problem will only cause you to:
-Get comfortable used to using the three herbs of your choice.
-Really take care of the three you have.
So I would not worry about it, as both of these are good things!
If I had to pick only three herbs to for a garden, I would choose:
-Aloe(Which you already plan for, and has amazing healing properties.)
-Lavender (Not only does it smell amazing, but it's scent calms, its oil can be directly applied to painful areas for relief, such as the temples for a headache and even the area of a cheek overlaying a toothache for relief. Its stalks with flowers double as a great gift in sachets, not to mention a delicious, calming tea for before bed. It is also a good additive to face wash.)
-Greater Plantain(Which has wide leaves, and is preferred over the ribwort because it has a more potent effect. This herb acts like a general cure all, it soothes broken or inflamed skin when applied to it. It counters infection and promotes wound healing, making it an amazing home-made ointment. Plus, tea from its leaves helps treat diarrhea, coughing, sore throat, hay fever and congestion.)
I hope this helps, Bastet bless your path Siax!