A well illuminated, private library that requires prior registration to enter. You fill out a short form, and in five minutes you are in. Unlike other private libraries in Madrid, this one doesn't require you to leave your backpack in a locker.
I'm currently sitting on a metal frame chair with a molded plywood seat, it is adequate for work and I always find armrests pleasant. The tables are generously sized, though there are two seats for what should be a single workspace. If it were to get crowded and someone sat next to me, my personal space would feel invaded.
One side of the library has floor to ceiling windows with adequate views of typical buildings of Madrid. I guess it would be a more interesting sight to eyes less accustomed to this city. Temperature is perfect during summer, not hot or cold, though the person in front of me is using some papers as a fan. The architecture I would define as "modern bureaucrat" with some hints of industrial architecture. The ceiling has a metal mesh which doesn't hide (or highlight) the nervous and circulatory system of the building.
The selection of books is limited, more specialized in art and media, from my seat I can pintpoint some titles that catch my attention: "Drawing and Down Syndrome", "Trees of Madrid", "The beauty of intimacy". I might just check out the bookshelf. The collection might be limited but a closer look reveals interesting things.
The crowd here are young adults, which is a welcome change from other libraries, which usually consists of older people and young students. It seems to be frequented by hip people. The person in front of me is studying some law related material and has a book "On violence". On the next row people are reading from their laptops, and nobody is on Facebook. The sharp presence of focus is felt.