Carlos David and Rubi are very nice and they usually answer back to you in the chat in a few minutes. I met Rubi during the check in: she's very sweet and friendly, and also available for any need or request during the stay.
The apartment was just like in the photos: small but very clean (even also if the bathroom is a little bit wet). It was perfect for a short stay or a weekend in Porto. They also gave me the possibility to leave my luggages in the apartment on the last day, in order to recollect them in the afternoon.
The apartment is in a very good position, near a lot of shops and only 5 minutes walk from Rua do Carmo.
I'll truly recommend Carlos and Rubi and their apartment for a stay in Porto!!!