Cristinas appartment was very good. It is well located and near to the main points of interest. It was clean and quiet enough, even being so close to bars and restaurants.
Christina is a very friendly person and took plenty of time for a nice chat, to provide information about Porto and some orientation. The check-in / check-out procedures were simple and worked out fine.
All in all a very good place to live during a Porto trip. I would book it again.