We stayed at Kiki and Teresa's place for two nights with my partner and had a great time! The apartment is perfectly located for everything you'd want to do and see in central Porto. You'd think it would be noisy because of this but it wasn't! As soon as we closed the windows and shut the shutters we were in our own little quiet world.
The kitchen was well kitted out and Kiki even left us plenty for breakfast, which was a pleasant surprise. I envied their attention to detail and the apartment decorations. :)
When we make a return trip to Porto we'll definitely stay here again - totally recommended! Thank you both!
P.S. Listen to their restaurant and sight recommendations :)