With all the good comments here, let me temper things a little because my experience wasn’t the greatest. Maybe there should be a rule about letting customers know when a place is not a real lived-in place because it can make a big difference. From the pictures and description I expected a real, ready-to-use kitchen where I would only have to bring my groceries. The kitchen was real but the kitchenware was clearly put together from old, worn out and incomplete items. I found no kitchen towel or paper towel, no trash bags, no wooden spoon, no real salad bowl (only a very low one), no lid for the frying pan (only small lids), no colander. Several handles were broken (saucepan, lids). Kitchen knives and scissors were dull and didn't cut properly. There remained almost no cooking oil, and there was just a tiny bit of liquid dish soap and it was cut with water. It all felt very cheap. I may be wrong but I don't think it's in the spirit of Airbnb or in its guidelines to let the traveler buy basic kitchen supplies. From what I read, that’s also what the cleaning fee is for. As a consequence trying to cook simple, basic meals was difficult and felt like I was nature camping.
There was a window in one bedroom that was not closing properly. It just could not stay closed. That was an issue because of the heat during the day, and the noise during the night.
I don’t know what is standard is Spain concerning pillows. I prefer my pillow to be thin. But these pillows were not only thin widthwise, they were very, very small in size. There were more like cushions.
The home decor is low budget but it is really warm. A few cupboard handles that stay in your hand when you pull them, telescoping drawers, a dead light bulb, etc. Nothing too bad, but again, I think a real lived-in place would be better furnished and maintained. At least the Ikea sofa is confortable. The rather large, confortable bathroom, with enough room to display one's products, is probably the strongest suit of this apartment, whose layout is spacious enough.
And yes, the old building is nice, the location is good, the metro station close by is convenient. Miriam was nice, welcoming and made my arriving and leaving very easy and I recommend this place if you intend to take your meal outside.