An enclosed screened in patio room like this can be enjoyed for most times of all seasons. And possibly due to the added sense of privacy, it just seems to have an added atmosphere of relaxation.
Because it is enclosed and the climate can be controlled a little better, the choice of plants and plant varieties can be broader. While most landscape plants placed on outdoor patios, courtyards, or any landscape ideas can be brought in for cold seasons, there is still a tendency to leave some out due to the added work of doing so. In an outdoor room like this, you're likely to see and choose more tropical and sub-tropical plants for the area.
In screened in patios like this where there is less wind, rain, and harsh elements, there is also an opportunity for more garden decor, indoor quality furniture, drapery, and tile work.