We stayed at Martin's flat during January as two families. The flat is at a great location, so central we hardly needed any public transport (apart from going to Belem). As the flat is very close to four major squares where public tram/bus lines start or pass, it is also at the perfect location if you choose to use public transport. Despite being central, it was surprisingly quiet.
The check-in experience is fantastic, Andre helped us with all the information that we will need and even more.
The flat was full of light, very clean and comes with all the amenities you can think of.
The building is a 200 year old building, the flat refurbished very tastefully and has a lot of character.
Highly recommended!