The flat is really nice itself, modern and tidy. Good design, washing machine, all utensils. Juan was very welcoming and advised a lot about attractions.
As for problems I faced. There was no wifi at arrival and it was fixed next day.
Location - is not one that expected, even though it's near Rossio Square. The street leading to the flat is filthy and smelling toilet. Homeless use it to ease themselves (even not minding passing people). By evenings it does not feel safe there, especially if you are a girl. Windows of the flat facing other building, not the Square. Moreover the way is full of stairs, so luggage is a very challenging issue. There is also another quite a longer way to the flat, which I had to take to escape from the mentioned problems to some extent.