This is a great value choice.
The apartment is professionally managed and maintained properly. It was very clean and well furnished with everything needed for a comfortable stay (beddings, towels, electrical kitchen appliances, dishes & soap, toilet paper, etc). There are a couple of minimarts just across the flat for anything extra you might need or for grocery.
By distance, expect under 15-min walk to many attractions (Jorge Castle, Sé Cathedral, P. do Comerçio, National Pantheon, Portas do Sol Belvedere, etc.). The apartment is also very close to all public transport options, with easy access to/from the airport and to the rest of the city and nearby towns.
Communication with Marco was prompt and he was very resourceful and helpful. There is a guidebook curated by Marco which explains the districts of the city, gives insightful info on accessing tourist sites, and provides recommendations of activities and places to eat.
The check-in and check-out was done remotely but went very seamless.
Overall, this is a 5-star apartment! Highly recommended.