A wonderfully unique experience! The apartment is exactly as described, clean, and in an unbelievable location. Cláudia is amazingly helpful and communicative: she even covered our cab fare for us when we arrived until we were able to find an ATM. She's not exaggerating about the stairs: they are beastly (80 stairs from the Cathedral de Porto, just under 200 from the Ribeira District), but it is so incredibly worth it if you are physically able. Pack light and wear good shoes!