The adjustment was clean and comfortable with a quality bed and adequate kitchen facilities.
I felt safe in the neighborhood, though it was not the tourist driven hub as if you were in the center (that area is only a 20 minute walk away, however). On the plus side, I got to hang out with families in the park and enjoy walking along the river.
I read the other reviews carefully, and noticed many of the same things other reviewers mentioned. It is a ground floor apartment, so there will be noise from the street. I didn't find it too obtrusive, and was able to sleep well. If you're a light sleeper, you should consider that. Communication was mixed. Quick confirmation and easy check-in procedures, however, later communication was frustrating. I think the host wanted to provide a complete answer, and so did not answer for 3 days instead of indicating the uncertainty. I can appreciate his choice; it's also frustrating and I would have appreciated. a quick note to say "I don't know yet."
Would I stay there again? Sure. Would I look for another part of town to better explore more of Madrid, probably.