Nina’s place is very close (walkable) to Plaza Del Ll and Plaza Mayor. The street is noisy as you expect it to be in Madrid, but, once you close the windows, it is “quiet” like a dead city in Germany or a similar country... there is public transport (bus and Metro) less than a minute or two. The apartment itself is extremely clean and simple but very well furnished. Wifi works seamlessly. All in all, highly recommended 👍🏼