First off, Ronaldo & Carla's place is super stylish, and I appreciated the touches of art everywhere. They were very accommodating to me, and I can tell they have a strong passion for hosting people.
My only complaint is that it was COLD. The guest room is in the far back of the apartment, near a door that leads outside I believe, which made the room feel about 10-15 degrees colder than the main living room/kitchen area. I happened to visit when Chicago was especially cold, so I definitely felt the difference. The bed itself was surprisingly warm, but I still had to layer up and sleep with the blanket over my head because of the chilly air.
So I would not recommend staying when it's really cold, but otherwise I would! Ronaldo and Carla are a very sweet and friendly couple.