Carlo's place is in the best possible location for a first time visit to Porto. On the river front with beautiful views and only a 20 min or so walk to old town, it was perfect. Carlos himself was so accommodating with out check in/check out times and his communication was so quick - he is a very attentive host. The only downside I would point out is that it was very cold in the apartment at all times. I did flag this with Carlos and was advised the one small heater provided would be powerful enough and we could use the blankets provided but it wasn't and this made our stay quite uncomfortable during an October stay. We had to go and buy jumpers and still felt the cold. The apartment was a little run down in parts but this was incomparable to the amazing riverfront location so we didn't mind too much - not to mention the amazing local restaurants nearby!