Our stay at Diogo's place was very smooth. Diogo has been very kind and hospitable - we arrived one hour late due to a bad accident just outside Porto and Diogo was very patient. We also found a welcome drink and some treats!
The flat is in a great location, only 5 minute walk from the bridge Luiz I, you can walk everywhere and don't need to use any public transportation.
I would say that the flat is perfect for 4 people, with the two bedrooms and the shared bathroom. The kitchen is fully equipped (even washing up liquid) and the bathroom has all you need.