Carmen's home is located very close to the train station and is very easy to walk to. It is about a 20 minute walk down to real alcazar, plaza de españa, the cathedral. If that is a long way for you, there are many restaurants to stop at along the way for a tapa and drink.
Our room, and the entire home was clean. We stayed in a room with two twins. The bathroom space is small by American sizes but is large based on what we've seen elsewhere in Spain.
As a other reviews have mentioned, Carmen is a very warm, friendly person who enjoys interacting and getting to know people. If you are concerned about a trip to Spain and the difficulty of not know Spanish, Carmen is an excellent host. She only speaks Spanish but is very patient and even enthusiastic about communicating with others.
We would stay here again.