Regina has a lovely little flat in the Condesa/Roma neighbourhood, with a minimalist style but enough details here and there to make it cozy. There are beautiful plants inside, a very soft bed and a nice sitting area. Wifi is strong and the location is fantastic, about a 10-minute walk from Chapultepec station. Lots of bars and restaurants around.
Fair warning: If you are a light sleeper, bring ear plugs as there is construction going on from 8 am onwards on the weekdays. There is a lot of construction throughout the city though, so it's kind of hard to avoid. Other than some minor noise issues, we loved staying here and Regina was really kind and welcoming on arrival!