We stayed at DBO'Neill's place during our holiday in Porto. The apartment was spotlessly clean and the perfect size for two people. Carolina helped us check in and gave us a bunch of great recommendations when we arrived which was a nice touch.
We especially loved the little garden out back - you can't hear any city/traffic noise which makes it feel really tranquil. The bed was also super comfy.
Everything of interest is a short 10-15min walk away. We would definitely stay again in the future!