Firstly the the photo description of the apartment is very accurate. It is a stylish apartment, with two large rooms one for the bed and the other for lounging and eating/cooking. It is a bright apartment with large windows/doors that open to the outside main street.
We did not meet Diogo, we met his father who unfortunately couldn't speak any english (english was a filter search on this apartment) and he didn't/couldn't explain any of the house rules. For example there was wine on the wall (see photo in ad) some bottles have a price on them some don't so we were unsure whether they were available. In the fridge there was a half finished bottle of white wine, half a litre of milk, a loaf of bread and some odds and ends including fruit again unsure of the protocol, so we touched nothing.
There is a TV and music system in the apartment but no instructions on how to use, after a few attempts of using the multiple remote controls we gave up. Diogo informed us via a phone conversation that the toilet had a problem (that is one had to put your hand in the cistern and lift a wet plastic bag for it to flush) but didn't inform us that the light switch in the main room would keep falling off or that the noise from the main street was extremely loud. He has a double bed (which is small for me being 193cm) but to make matters worse the bed is not up against the wall as it has an indent wall and either the pillows would fall onto the ground or one needs to use a bolster provided) but the bed even smaller.
Summary great location as it is close to most things within Porto even the station is only 100m up the road, but it is an extremely busy and noisy street without double glazing so sleeping at night is difficult. As I said its an accurately described apartment in an excellent location but extremely noisy and poorly maintained apartment.