Daniel's accommodation was perfect:
Location: well located in the center of Porto, 6/7 minutes walk from Porto São Bento, next to Santa Catarina Street (with all major shops) and with two supermarkets 3 minutes walk.
The apartment: the accommodation, in addition to being very beautiful, had all the essentials, iron, kitchen utensils, oven, large fridge, washing machine etc. + 2 large TVs available with all channels and Netflix, YouTube etc. and it can accommodate 4 travelers with very comfortable bedding.
There is also an air conditioning system and all the necessary linen: towels, sheets etc.
As for the noise, you really have to be a light sleeper for it to be little annoying but otherwise it wasn't a problem.
I recommend it 200% for future travelers, the price is affordable and Daniel is very responsive. He answered all my questions and contributed to the smooth running of my stay :)
NB: there is even a cleaning service for 6€ / hour which is perfect!