Telmo is great host and the flat is brilliant. Telmo met us at the apartment and welcomed us in, which was very nice, and communication prior to arrival was great too.
The apartment is lovely, has pretty everything you need in it (even scissors in the kitchen which can be hard to come by at times!). There is plenty of space, and the apartment is very light and airy. Tram stop is right in front of the building, but not far a walk over the Ponte Luis bridge or down to the Port houses side of the river. The en-suite is a bonus and the view from the balcony is the icing on the cake.
I would definitely recommend Telmo's apartment, and would more than happily stay there again if back in Porto.