One apartment of several in a converted centuries-old building, tastefully and simply done, and bright. And about as central as you can get: you can lie in bed and watch the patrons in the busy tapas bar opposite, a floor below.
Great power shower. The place could have been cleaner (hairs around the toilet) and better stocked (we ran out of toilet paper and coffee fast). Our contact was helpful and pleasant, but not always very responsive.
Hard bed, if that’s your thing (it wasn’t really ours) but its location directly underneath the main stairs of the building meant we got woken several times during the night to the sound of clomping feet. This was more of a problem than the noise of Madrid partying below, which the good double glazing and a pair of earplugs kept out well.