My friends and I LOVED staying in Carol and Ivan's place. They were more than flexible when our flight plans from Dublin to Madrid got royally messed up due to bad weather and flight diversions (we ended up checking in much later than expected due to these issues, and Carol and Ivan were great). The woman who checked us in was very kind and very patient with me when my usually fluent spanish was broken by exhaustion and frustration with our previous air travel (i said "soup" instead of "soap" by accident!). Madrid is my favorite city, and Carol and Ivan's apartment is in the PERFECT location if you want access to nightlife, shops, restaurants, the Plaza Mayor and Puerta de Sol. It was also super accessible to the metro and public transit. The apartment was clean, and perfectly spacious for 4 adults. I highly recommend this place!