Absolutely great place to stay in Porto! Our family stayed in Carlos's place for 3 nights and we loved it. Very good location - surrounded by good cafes, 5 minutes walk from Porto University, Clérigos Tower, and famous Livraria Lello bookshop. Porto's "hop on hop off" blue bus stop is just around the corner (in front of National Museum Soares dos Reis).

The apartment and entire building is newly remodeled, very clean and comfortable. Windows overlook a small park with large platanus trees and a small pond.

P.S. Checkout Crystal Palace Park nearby - it is bigger than it appears
on tourist maps (it continues west) and provides nice evening stroll after you spend a day exploring old part of the city.