First of all, we were fully disappointed that the hotel was too old to avoid any draft (cold air) from the street. Other facilities (ex. a drier, shower) were also 'OUT OF DATE'.
The make matters worse, this hotel suddenly didn't accept the credit card for accommodation fees without any notices, so we were forced to pay by cash. As this is not problem from our side, but the hotel's side, we asked them to charge these fees to our credit card later, but the person at the reception didn't seriously consider at all and said 'Only pay by cash'. In fact, the person at the reception behaved herself very awfully, not in a professional manner at all. We complained all other details to this hotel cc their manager, but they didn't reply more than two weeks. We are now sending our claims to card companies/alliances to take an appropriate measure to this hotel.
We DONT use any more this hotel. Even if there is only this hotel available in the beautiful Porto city, we would give up to visit there. It is a better option.