We had a very pleasant stay at the Belle Epoque Appartment. We received the Check-in Instructions from Luis and had no problems at all entering - so that part was very easy. The place was very clean and tidy, its a small place but you really have everything you need there. The location was unbeatable, having every (important) part of Porto in walking distance. The only thing that bothered us was the noise outside the room (for example someone coming up the stairs or if there is someone in the apartment above yours, you might hear every step).
Nevertheless, we had a very comfortable stay and an easy communication with Luis!