Guillermo is a great and kind host! He was very helpful for our arrival and was attentive to our needs. The apartment is modern and in an excellent and safe location. The building has security and is near great restaurants and a metro station. It is an ideal spot to explore the city. We had an issue with the water heater, but Guillermo was able to fix it right away. The only downside was not having in air conditioning. However, I learned that this was a common thing in Mexico City. Beware of the season you come to Mexico. We came in the rainy season and mosquitoes are an issue when you have to open windows to cool the apartment. Some of us learned that lesson the hard way while sleeping. Overall, we had a great time at Guillermo's apartment.