This is a great base to use for a holiday in Porto - the location is close to unbeatable (close to the Metro or a short walk to the city centre), the apartment is nicely equipped, the hosts extremely (!) helpful and welcoming (this was a real highlight for us, thanks for everything), and the city itself is extremely scenic.
A little bit of noise from the road outside is probably unavoidable in the city centre, and we did need to do a bit of cleaning as some previous occupants had let a bit of mould grow on the shower, but these are very minor points about an apartment that we really enjoyed - so a well deserved 5-star review from me, and a strong recommendation to anyone considering this apartment, it's an excellent option.