First of all: it's a very nice and clean apartment, well equipped with the things you'll probably need. The location is pretty central in Bairro Alto, so everything is pretty walkable and easy to reach. We went there in summer when it was sizzling hot, however, the apartment was always pretty cool and nice - hence we didn't use the AC much. The beds were comfortable, massive TV (if you need it), coffee maker etc. - we felt pretty comfortable there.
If you are super sensitive to noise then one of the bedrooms might be a bit tricky - since one bedroom is facing the lane/alley and it's basically a nightlife area, you will hear some noise here and there. It didn't bother the persons to much who were staying there, but we thought it is worth mentioning it.
One thing we have to point out - the communication wasn't the smoothest while we were staying there. We had a couple of requests and things we needed - it seemed that these things were not necessarily easy to handle or at least to reply to and we had to follow up quite a few times to get these things sorted - any other place, no biggie - but this place had a high price tag on it, hence we do expect a certain quality around communication. The communication was done by a AirBnB service company - guess they were pretty busy at that time.
However, it was a nice stay overall with no major complaints - constructive feedback would be only around communication. I'd stay there again :)