Sacha's place is a good choice for an un-fussy traveler. The apartment contains 4 bedrooms, some of which are occupied by long term and others by short term renters. Everyone is quiet and respectful but it's not a particularly social atmosphere if that's what you're looking for.
I stayed in the smallest room, which is a good choice for people on the smaller end of the spectrum and traveling without a lot of stuff. The bonus of the small room is that it's closest to the sunny living room--a great workspace if you're working on the road.
There is no central heating (this is common throughout Portugal) but Sacha provides a space heater, which heats up the small room in no time.
Kitchen is clean and easy to use. Apartment has 1.5 baths. A cleaning lady comes once a week.
Sacha is always available via whatsapp and very responsive.
Closest train line is the yellow, station Marques. Otherwise it's about a 30 minute walk to the center of Porto. The metro runs until 1am. The park Quinta do Covelo is very close by and worth a visit.