The stay was comfortable without any major issues. The location was great, right in the centre of Porto and very close to amenities, sightseeing spots and great food options. The air-conditioning is in one of the bedrooms but it does cool down the whole flat.
I did notice some stains on one of the bedsheets which was not very pleasant but overall the cleanliness of the apartment was okay. There amenities are quite basic (few cooking ingredients, no washing detergent for clothes etc). It was also a bit inconvenient to collect the keys in a separate location so make sure you double check the instructions before going to the apartment. Especially since Porto has a lot of hills so walking can be tiring! But overall good value for money and convenient location.