Unfortunately, I would advise against staying at Mariana's place. There's a major issue with lack of heating coupled with insufficiently insulated french windows. Out of 5 nights, the first one turned to be so cold that we had to cancel the other nights and find another place so that we don't get sick. Mariana (the host) responded properly quickly and refunded the 4 remaining nights. Aside from that, when we arrived there was a stench and we had to open the windows to breathe "fresh air" (or what you get in a big city like Madrid) but the odor came back little by little with sewer smells. One could argue that you will find that elsewhere in big cities so if you're used to this, you should be ok. We noticed there's a huge concentration of wifi networks around the flat which furthere hindered our sleep. As a last detail, a box of local sweets was on the table when we arrived but when I checked the expiry date, I saw early 2021 and we're now in early 2022...