We had a wonderful time during our one week stay in Porto at Mariana's place. It's perfectly located and an absolute gem for anyone who wants to explore the city by feet: Ribeira, Ponte Dom Luiz I, São Bento, Porto Cathedral - a lot of sights are literally just around the corner.
The flat itself feels very spacey, considering that it is just one room. We've shared it as a couple and got along very well.
Most of the basic items that you'll need for your stay (p.e. oil / some basic herbs for cooking, shampoo, toilet paper, even sunscreen) are already there for your usage and if something should be missing, there is a supermarket close by.
Make sure to read the cute little notes that former guests have left in the appartement, they include nice tips for places to go and things to do.
Thanks for having us, Mariana!