Location, location, location! You won't find a better placed apartment in Oporto if you want to be in the middle of everything. With a partial view of the river and the famous Luis I bridge, it really is hard to beat this location. As an added benefit, access is limited at night, so you won't have random people wandering near the building at all hours, and it also helps keep noise to a manageable level.
The apartment itself is nice and well-lit. It can get warm outside, but the two high-powered fans and open windows keep the place cool.
Thanks, Eduardo, for a great place to stay in Oporto!