We stayed at Airnaldo's for 3 nights. Check in was very detailed and instructions were clear and simple which made it quite easy. The location was right next to the main Atocha train station which was very convenient for travel. It was also near the local metro, as well as a popular museum which made our trip quite easy. I travelled with one other friend and the space was adequate for the two of us. The only qualms we had were with cleanliness. There were several things that made us feel like the space was not cleaned thoroughly. I had grabbed a cup from the kitchen area and found it to be stained with the previous guest's coffee stains, like it was barely rinsed. There were 2 towels only and both were also stained and looked very used. We had pulled out the third single cot from underneath our twin beds and found the sheet to be covered with flakes of dust or skin (we didnt end up using it). Overall it was in a great location at a decent price.