I highly recommend staying in Marco and Carla's apartment if you are visiting Porto. It was extremely easy communicating with the hosts and the apartment was exactly what I was after.
They've put together an excellent personal guide to Porto which gave some amazing recommendations, such as the Zenith bar which does the most delicious brunches. I thought that was a nice touch and it certainly made my trip that extra special.
The location was ideal with lots of places to eat nearby. Both the Livraria Lello (a bookshop which has a stunning staircase) and the Igreja do Carmo (a beautiful baroque church) are only a 5 minute walk away.
I'm so glad I picked this apartment to stay in during my time in Porto and will be recommending it to anyone I know who plans to visit :)
Thank you Marco and Carla!