Summary. Everything was perfect.
Details of the owners:
They are very friendly people. Always pending of anything. If they can help you in your demands, they will do. Very comunicatives, quick replies, all advices they gave us were very usefull. Simply perfect owners.
Details of the apartment:
Incredible location. Imposible better. In the heart of Alfama, very touristic part of Lisbon. Many restaurants, interest points, museums very close of the apartment.
The flat is very clean, looks new. For 6 adults is fine. Kitchen and bathroom are big, three bedrooms enough for two, for keep your clothes and sleep well. Although the flat is in a very touristic street, in the night is very quiet.
I dont know what else to add. Just give thanks to the owners. I recomend 100% this flat for any kind of travellers.