This apartment was centralized and easy to get to; it is located in the historical district of Madrid. The metro station was 2 minutes away (on foot); it was a block away from Plaza Mayor, and pretty close to everything else in Madrid. The apartment itself had all the amenities that you will need, especially if you like to make your own breakfast (and/or dinner) prior to venturing out and explore. Michelle and Marta were very responsive, friendly, and went the extra mile to give you tips about what to do in Madrid. Our flight got delayed and we didn't get into the apartment until after 1:30 AM, and Michelle was there to meet us.
I like the fact that there are two bathrooms and two bedrooms. There is a grocery (Dia) store very close to the apartment, where you can find pretty much anything that you will need for a family (in the US). Also, there was a convenient store right next to the apartment, where they owner (Vietnamese) sell home made food.
Overall, I highly recommend this place to anyone visiting Madrid. Close to all tourist attractions in the city (and very easy to walk around).
Thank you Marta and Michelle.