It was the second time I stayed in one of the apartments of Eugenia and Luis (first time was in 2016).
Great location to explore Porto, nice apartments and very friendly, flexible staff (we could easily check in late at night and we could also store our luggage there after checkout). We also really enjoyed the botte of port wine as a very nice welcome gift!
Please note that you need to climb several (steep) stairs in the building to get to the apartment (no elevator available), and that the bathroom is rather small and narrow, so it might not be ideal for everyone.