Claudia's place was an absolute delight. What you've read in previous reviews are correct:
It is a bit of a hike, but as long as you're prepped then its not bad (Make sure to have your driver drop you off at Travessa da Bainharia 31, 4050-253 Porto, Portugal for the easiest hike).
It is one of the best locations to be in once you've gotten yourself settled. To wake up each morning in the old city makes you feel transported to an older time, and the views around the corner are fantastic.
Claudia's recommendations for the city are complete, and insightful. We loved her preferred spot for francesinha.
The washer machine was a very welcome help in the middle of a long trip, and she supplies plenty of detergent pods.
If there was *any* downside I would say that when you have the window open you can easily hear people walking by the apartment in the middle of the night/morning. I'm sure the traffic had increased since our stay was in June when there are many celebrations occurring in Portugal, but we didn't mind it. The bed was completely relaxing and eliminated any feelings of noisy intrusion.
Overall we greatly enjoyed our stay, and if we were to ever return to Porto we would rent again in a heartbeat.