We had a lovely stay in the apartment of Maria. She provides good information about the things you can do in Porto. Made us feel very welcome, with a nice typical pie and small bottle of port. The apartment is in a perfect spot, nearby you'll find the lello bookshop and some nice trendy shops and restaurants. We've visited the Ribeira, which is only 10-15min walk (downhill!). On the other side of the river you'll find all the Port Winery caves. They provide guided tours of half an hour so after the tour you know at least what port you should taste!
Really lovely place and we had a perfect first stay in Portugal! Highly recommandable. Thanks Maria!!