This is really a compact studio apartment, nicely decorated with a comfy mattress. It is clean. Christina is lovely and helpful in explaining about the place and the area. The location is right at the foot step of a tram stop, a bus stop and a taxi stand. And a stone throw from the Duoro riverfront. There is a few restaurants just below the building.
The downside of this place is the noise. So beware if you're a light sleeper. During my 2 nights stay, there's renovation work directly across from the apartment. There are noises till late night from the restaurants below. Lots of noisy seabirds outside on the roofs, balcony railings at the slightest of dawn before 6am!
On my second night, the unit above most likely running as Airbnb as well, had a group of people checked in as I could hear heavy footsteps and noises, which means the flooring/ceiling wasn't sound proofed when the place was renovated. It was hard to have a good sleep with all the noises.
It would help if the studio is air conditioned or at least a fan provided to help lessen the noise level from outside and above. As the unit is compact, there is no ventilation. I had to open one of the balcony door slightly to ventilate the air and had to shut it before going to bed to minimise the noise.