Great Japanese restaurant
Dinner for two at the sushi bar (where it's 40% off in some of the sushi dishes): a bottle of water, a cup of green tea, a bowl of miso soup, tuna tartare, a bit of beef shabu-shabu, assorted sushi (10 nigiri and 8 maki) and three extra pieces of sushi. (The discount applied to all the sushi we ordered). Total: ~€54.
Pleasant atmosphere (the place is spacious, but not noisy), roomy sushi bar, nice staff. All sushi was fresh and tasty. Ditto about the miso soup, and the shabu-shabu (which the itamae kindly offered to us as an offer: €2 per person). Perhaps the "worst" item was the tuna tartare: it was not bad, really; just okay, compared with the rest (it lacked some vinegar, to my taste).
It's a great sushi place in Madrid, with reasonable prices. I heard at least the itamae and one of the women attending tables and the sushi bar speaking Japanese; I guess they *are* Japanese. That is something, given how many "Japanese" restaurants in Spain are staffed entirely by Chinese, Thai, etc., and offer a subpar and strange mixture of Asian dishes...