Andre's place is well located for sightseeing in Porto, not far from Sao Bento train station and close to Clerigos Tower and the Livraria Lello bookshop with its J K Rowling connection. Basically, you can walk to just about all the sights in Porto from the flat but if you go down to the riverside (which is a must) it is a steep walk uphill back. The downside of being centrally located is that it is quite noisy in the evening but it didn't stop us sleeping.
The self check-in is simple and if there is anything you want to know Andre will respond instantly. He very kindly allowed us to leave our bags in the flat on our last day (we had a late flight) on condition that we collected them before his next guests arrived.