This is a great place to stay if you want a quiet time in Porto. Tough walking to the sights is a bit far, there's a bus that leaves on the corner of the street which gets you to the center in about 10 minutes. There's a good supermarket about five minutes away and the kitchen at Sacha's is fully equipped.
If, like me, you're looking to get some remote work done, the Internet is really, really fast, so that was a major bonus.
Sacha himself is a friendly, helpful host that respects your privacy. All in all, I had a very pleasant stay and would recommend this address to anyone.