We had a lovely few days stay in Porto at this apartment. Luis was really friendly and helpful throughout the booking process and met us at the apartment on the first day to make sure we were settled.
The accommodation itself is great - everything you need, excellent bed, plenty of local information and a short walk from the sites.
The only downside is that building work on the street mean it's very noisy from quite early in the morning. So I would recommend this flat and Luis is a great host but bring your earplugs!