The communication with Rui went very well, he sent very quick responses and found a solution for the fact we were 5 people. A very kind cleaning-lady received us to give us the keys. She even brought us to the metro!
The appartment is nice, at 30min from the city centre. It's about a 20min walk to the metro and then for €2 you are within 10min in the city centre. If you take a taxi it will be about €7, so that's a fast solution if you don't like to walk.