My girlfriend & me loved our city trip to Porto and we would certainly recommend a stay at Sant'Ana! The house is modern, clean, nicely decorated and has everything you need. It's perfectly located in the historic centre, plus at night it's calm and quiet.
We arrived quite early in the morning and the previous couple just left whereby the house wasn't ready yet, but we could leave our bags at Claudia's place where she enthusiastically and warmly welcomed us. All her tips about places to visit, areas to walk through, areas to eat, the typical Port dishes to try out, etc. were a real plus and helped us during our trip.