We stayed for a week in June 2022 and had a lovely time. The flat is nicer than the current pics (it's been redecorated since they were taken -- the walls are no longer yellow). It is very clean and cosy. It's about a 7 min walk from the beach and even less to the train/tram which takes you into Porto in 30 mins. (Or you can take a taxi in about 20.)
There's a street of famous seafood restaurants nearby, too. So definitely check that out if you want to sample freshly caught fish.
It's very close to the airport (15 drive) and really just a lovely, affordable place to stay. Daniel and Danielle met me with a bottle wine, a bottle of water, and freshly picked berries from his grandparent's garden. A very lovely welcome.
If there's any downsides it's that you can hear quite a bit of noise from other flats. The good news is that Portuguese law states that you can't make loud noise after 10pm and we found that everything really quietened down at night, so nothing affected our sleep. (But maybe pack earplugs if you're very sensitive!)
Overall we'd all highly recommend Daniel as a host and his flat! Thanks for a great holiday!