In one word: Perfect
Maria is amazing. Although she doesn't speak English, you can ask her anything in the chat (airbnb), which has an integrated translater. She usually replies within 2-5min
It was my first time in Portugal and I had some issues with the language and the authorities and she was very helpful with that.
The location is a bit outside the center, which means cheaper prices, better restaurants, more supermarkets. Still you can get everywhere within 10-20min, especially because it's next to Praça Paiva Couceiro, where many bus lines go. There's also 2 metro stations about 8min away.
The room was very clean, which I can tell because I have a lot of allergies and if I don't react, it's very clean.
Maria even washed my clothes which was amazing because I stayed quite long.
The internet is very fast, I worked there the whole 3 weeks. The big desk was a huge advantage too.
Only negative point was, that there is no heater. But there's about 5 big blankets, so sleeping is fine. Just working was a bit cold sometimes.
Insulation of the windows is great, you can hardly hear the big street outside.
All in all one of the best rooms I've ever stayed in. Thank you Maria!