We had a wonderful stay! I have nothing but good things to say about Clara's place.
First of all, she was a wonderful host - our flight was delayed and she still came to meet us, at 1:30 AM, to let us in and show us everything we need to know about the apartment.
We told her we wish there was another key but we'll manage anyway, and she was kind enough to offer to come again the next day, just so she could give us an extra key. And even brought us pastries! I really appreciated that.
The apartment itself is just great. It's actually 2 separate apartments with a common hall. One is a studio apartment and the other one has both a living room and a bedroom. Each one has its own bathroom and a kitchen. So it offers the possibility of complete privacy, which is great.
It's very spacious and comfortable and has everything you might need. And it was very clean.
There's AC (not so common in Porto), and the shower always has hot water, which is great.
The location is fantastic - it's very central (the street is parallel to Santa Caterina), but somehow it's very quiet!
You have everything you might need around - many coffee shops and bakeries, a supermarket and a laundromat just down the street.
I 100% recommend this place!