Monica's spot is great. Very close to good restaurants, nightlife, museums, art galleries, and best of all - street tacos. Try beto's at the intersection near by. He's there every night!
Monica and her partner greeted us and sent us off. They were communicative and helpful. Appt is clean and wifi is great. Not a ton of extra space. 3 people were very comfortable. 5 might be a little tight, but it should be manageable. There is a tree house feel at the place. It's very fun!
Tip - ecobici is a great way to bike around the city! Totally worth it. There are stations everywhere.