Carlos's Place is located in the heart of Sol. It is bang next to the Puerte de Sol where all the activity is happening. I had a wonderful experience staying at this apartment. It is small but perfect for two people. The most important thing is all the major tourist locations were just few minutes walk from the apartment which was important for me as I didn't want to waste time traveling. The only thing lacking was an elevator for the apartment and if one has a lot of luggage like I did it could be tough to take it upstairs. But this was only a minor inconvenience. Carlos wasn't around but his colleagues Antonio and Mario helped me a lot especially Mario including suggesting some great places to visit. If I happen to visit Madrid again in near future I would surely be staying at this apartment again.