Sebastiaan's place is very nicely put together and very centrally located, a short walking distance from Sao Bento station. This means a very convenient transit if you are travelling over from Lisbon via train (like we did). We were able to access all the key attractions in Porto on foot from the unit. The unit is spacious and has all necessary amenities. It is within comfortable walking distance from everything.
Only gripe was the renovation work which took place downstairs which meant drilling and knocking noises at 8am on our last day (we didn't really mind because we had a train to catch anyway).
Thanks Sebastiaan for the hospitality and the useful compiled guide to Porto!