i recently stayed for a long weekend with my girlfriend, unfortunately the day before there was an issue with our apartment (which was out of their control) so we was contacted with 2 options that we can transfer too or receive a full refund, the options we where given matched what we paid for and was still in a great location so we went ahead with this.
at check in we went to the centre where we received our keys and the staff explained everything to us, they then supported us with travel arrangements/advice
Our apartment was very clean and exactly as it was advertised on the photos.
If/when we return to Porto we would 100% use this company again