Charming and functional. That's a hard combination to make a reality, but Karen has done the trick. Prior to our arrival, Karen was communicative and made sure check-in would be as seamless as a process as possible. She was gracious enough to leave us a spread of fresh fruit, chocolate, and a bottle of wine upon our arrival.
Her apartment is open, airy, and bright--and that's before you head up to the terrace. This is the kind of Airbnb you have a hard time leaving in order to explore your surroundings because it is so lovely. Speaking of surroundings, Karen's apartment is very close to restaurants, cafes, and convenience stores (< 10 minute walk to quite a few options)--while being on a residential street. Public transport is very proximate; there's also an ECOBICI station downstairs! DF is a city of tens of millions, so noise is part of the environment and unavoidable. That said, Karen's apartment isn't unduly loud.
Her apartment is bright--which I think is a great thing--so if you are light-sensitive and want to sleep in, bring a sleep mask. Also, note her apartment is on the fourth floor of a walk-up building if that is cause for any concern.
Writing this, I wonder why I left. I'd return and highly recommend Karen's apartment for leisure or business travel.
She is a fantastic host.