This is the most common solution used today. Paints are much more environmentally friendly than they used to be, as the solvent content has been drastically reduced in recent years. Acrylic paint is preferred to glycerine. Some so-called natural paints are made from 100% ecological and healthy materials: linseed oil, chalk, natural gum, mineral compounds, clay soil, lime, etc. They are micro-porous, which means that they do not block water vapour and therefore allow the house to breathe better.
Paint can be matte, satin, glossy, velvety…
Matt paint absorbs light, so it can smooth out small imperfections on the surface. On the other hand, it is not easy to maintain, as it gets dirty. It lends itself to muted atmospheres.
Gloss paint reflects light. It is well suited to kitchens and bathrooms and is easy to clean. On the other hand, you need a particularly clean wall, without any defects.
Satin paint is the right compromise: it is well suited to living rooms. It is easy to clean (lightly wash with clear water). It reflects the light slightly, with soft reflections.
Velvet paint has a less marked shine than satin, and allows for muted atmospheres, as with matt, but is less fragile.
In all cases, the preparation of the walls (and ceilings) is essential. The surface must be sound, clean and dry. Good to know: it is easy to apply a glycerine paint on an acrylic paint but the reverse is not true. Glycero paint (with solvents) must be carefully sanded to make the surface less smooth and tacky for water-based paint (acrylic).