Jerónimo's place is very nice, well equipped and looks newly renovated. The kitchen is ready even for advanced cooking (which I did, a good grocery store is near), there are extra covers for the bed, and an electric fan for when it gets too hot. The location is great for exploring Porto!
The only disadvantage is that it's a relatively small studio and the bed was quite short. I'm 192 cm and my girlfriend 178 cm and even she had to bend her legs a little bit.
On a hot night, it's better to sleep with an open window as the studio can get warm; the street can get a bit noisy but it's not a big problem.
Overall I'm happy with my stay, I would recommend this studio to anyone who wants to have privacy and a very nice cozy place to return to after a day in Porto! Jerónimo communicates well and solves any problems you have very fast.