The appartement is located as a perfect hub to discover the city: only 300m from the Sao Bento metro and within walking distance of the city's highlights.
The space inside is limited but when walking a whole day outside you just want to take a hot shower and sleep comfortable. And we slept well: a good bed with ok cushions (they could be something thicker) and almost no noice at night.
The kitchenette is really tiny but we used it only to make tea or coffee: there are plenty of possibilities to eat outside in Porto, even closeby.
(There's also a mini supermarket within 5' walking distance.)
Everything looked tidy and clean. We stayed here for four nights and didn't regret booking By Clerigos for one second.