Just in case anyone from here in in Madrid this week…
Best avoid a wide swath around the Congress building/complex. The Prime Minister is due to be re-installed, around which there’s a fair bit of political turmoil. (The past weeks have seen fiery protests—literally fire and political shooting, among other disturbances.)
There are already road and metro closures announced, and at best, the area will be a hassle. Kind of a pain, as it’s in between the center and the Prado and Atocha station.
I generally suggest that visitors have no particular need to shy away from the very regular protests on Spanish streets. This one’s a bit different.