Overall a decent place to stay: location is good, mostly quiet at nights and you got the basics covered in the apartment. There are few things to consider though. Tram is running in front of the house and can wake you up early if you're not used to such noises. As you are in a historical building, the floors are not entirely even, so the bed isn't either. But you'll get used to this. Internet is not the fastest, but you can get the basics done with it.
What makes the place unique is the location: cute sloping street with the "postcard" tram. You'll also have Feira da Ladra flea market around the corner. For the breakfast Copenhagen Coffee Lab is around another corner and a fantastic place in the morning. Access is easy but bear in mind there's a steep stair to the apartment. Fine with hand luggage but would not want to be there with 30kg large baggage.
Host was very helpful when asked about recommendations etc - kudos for that!