Oscar and Iryna were perfect hosts for this lovely flat located in a safe, great part of Madrid. From the airport, it is very easy to take the RENFE train C1 which takes you directly to Principe Pio station. The RENFE train is just 2.6 Euros which is even cheaper than taking the metro from the airport. From the Principe Pio station, it is a short walk to the flat, located in a lovely residential building close to the Royal Palace. Iryna was a wonderful host who was flexible with our check in and provided a detailed note book with all the kinds of great suggestions about Madrid. We are a group of colleagues from Taiwan, so we were delighted when we saw that they also practiced the hygienic habit of removing street shoes upon entering a home, and even provided a basket of house slippers. The flat was very clean and perfect for our group of 4 as it had 2 nice sized bedrooms and 2 full bathrooms. Madrid's tap water is not only safe to drink, but it is one of the best in Europe, so you should go green and bring own water flask. There is a washing machine and drying rack, so bring your own powder detergent. For groceries, we walked ten minutes to the DIA, a wonderful Spanish grocery chain with very good prices, and DIA accepts credit cards, including Amex. We bought great bread, cheese, ham, fruit, and other staples from DIA, But the most terrific hidden treasure is Spanish white and red wine from DIA which was excellent and cost under 2 Euro a bottle. We had a great stay at Oscar/Iryna's lovely flat and will definitely go back again. Thank you again, Oscar&Iryna!