Our party of 3 adults arrived 2 hours early and thankfully the cleaning person was there and let us enter. Maria was there shortly. She is a very nice host and provided us with a lot of information. The flat is on the 2nd floor so there are a few stairs to enter and a few stairs to go down to the backyard. I thought this would a house but it is flat. I am from the US so the definition is probably different. It was very quiet and the flat is very clean. The kitchen was well stocked and the beds were good. The couch/ bed in the living room is very low to the ground probably better for kids. I would have to question the 15 minute walk to the city center. I am a walker and I would say 30 minutes to reach the city center. If you planned on a couple trips to the center a day that is a lot of walking. There are restaurants and shops near the flat but most of major attractions are in the center. An Uber ran us about 12 euros round trip. On a previous visit to Porto we stayed close to the Sao Bento train station and were able to walk everywhere. The location problem was my on me for not doing more research. In short, the flat and host were very nice and we enjoyed our time in Porto