I stayed at Aguiar's apartment in June 2019. I had a fantastic stay and I will try to offer an accurate, unbiased review.
The apartment was spotless, modern and stylishly appointed. I found the bed to be very comfortable. The appliances are all new. Shower worked well. Wifi signal was strong and fast.
The location is great. I felt very safe walking around tho I was never out late at night. 5m walk to Lago de Machado Metro, 5m from the ocean. Bars, restaurants and grocery are all within a few hundred meters. While centrally located, the apartment is on a quieter street so it was not noisy.
Aguiar is a very sweet and caring host. She is attentive and responsive. She insisted on being there in person to show me into the apartment upon arrival despite my flight being delayed 2h. Any questions I had about the apartment or the city were answered via text very quickly.
Downsides of the apartment are:
1. It's small. I'd be surprised if it were over 250 sq. ft. I was there alone and had no problems at all. Two people is doable but it would be a touch tight. Would likely work providing you weren't planning on spending a ton of time there. Also, if you are a big person on either axis (X or Y), this is not the place for you. You wouldn't fit in the bed or the bathroom.
2. No view. The windows are frosted, probably because they face into an unattractive interior courtyard/apartment wall. Not the place for you if view matters.
In conclusion, five star review from me! Nice, spotless place in agreat location at a good price with a wonderful host.