The apartment itself has a lot of potential, unfortunately it lacks character and at this stage requries refurbishment. It is in a good location and has a nice view from tha balcony but the smell of damp and sewage from the bathroom (shower and sink were completely blocked) as well as a very unpleaseant odour coming from under the kitchen sink makes it unwelcoming.
We reported the isse so hopefully future guests won't have to complain about it. I'm surprised the issue hadn't been taken care of before our arrival as it was quite an obvious problem, the water was not draning at all.
The apartment has been coverted into a typical tourist flat with little attention to detail and at low cost - therefore requires urgent refurbishment (sliding doors, plumbing issues, shower tiles - already a bit mouldy and chipped in places). It's a pity because it could be a really charming flat with a bit of TLC.
Finally, you have to be prepared to collect the keys from an agency located within a good 15 min walk. If you're with luggage forget it! If you're driving, you have to use an underground carpark to collect they keys from them. I must say it was a huge inconvenience.
I really hope this place will see better days in the future and someone does it justice. It is a real gem in Porto but at the moment its potential has been quite wasted.
On a positive side, the apartment is very spacious, has some great views and the sofa bed in the living room is comfortable. Our communication with the agency has also been very positive.