Lovely clean, modern and quiet apartment. Not much natural light (first floor apt facing small inner court) but this keeps it cool in warm weather. There is good heat/air conditioning. Everything works well (great shower, comfortable bed) and one can cook a meal even though the kitchen utensils are basic and compact. Good grocery shopping in immediate area - Dia, Lidl, etc. Nice Nespresso machine.
Metro station Palos de la Frontera on Line 3 is closest (4 minute walk), but Atocha Metro is 8 minutes away. You can walk to the 3 major art museums and Retiro park. Don't miss the Museo Archeologico if you like history. Only 3 euros or free for over 65. Maria is very friendly. Although we met Fernando to check in and he was keen to help too in spite of little English.