We stopped in for some brunch and each ordered the brunch combo 2 (€14.95), which came with…read morewonderfully seasoned scrambled tofu, an extremely rich and decadent ham+cheese croissant (essentially a croque monsieur), OK vegan bacon, and a solid enough avocado+tomato toast. The tofu scramble was definitely the highlight -- being cooked with seemed like kala namak (black salt) or something similar to give it that eggy/sulphuric character. The avocado+tomato toast was also decent, though needed some amping up with extra virgin olive oil and salt that they provided to season for yourself.
The combos also come with a choice of coffee drink -- I did a late, which was very well-made.
Overall, somewhat Spanish takes on various breakfast/brunch cuisines, done pretty well. Not a standout spot in Madrid, but a cool spot nonetheless that I'd recommended moderately.