Firstly, Fransico was more than accomodating when our train was delayed several times and we missed connections arriving in Porto in the wee hours. He never made us feel that this was an inconvenience.
The place is ideally located within walking distance of most attractions in the old city and it has a great view from two different vantage points.
We arrived in early Aug with a raging heat wave,the AC was only able to cool the sitting area, Although based on our last night in Porto I suspect that AC would rarely be needed in Porto.
I must also note that the apartment is 5 flights up, and the elevator was very unreliable, working only occasionally. However, if managing 5 flights of stairs is a problem, you might have challenges making your way around Porto.
I would recommend this place highly.