When i'll go back to Lisbon (cause I'll go back for sure !!), I will totally try to book this apartment again !! The apartment is really well situated in the city centre near Plaça do Comercio, comfortable, quiet, fully furnished and equipped and very clean.
I just have nothing wrong to say about the apartment.
To top it all, the hosts are very welcoming and helpful, they contact you before your arriving and make you stay very easy. They are very accommodating about the hour of arrival, and that helped me cause I was 2 hours late due to traffic.
So if you are looking to an apartment in Lisbon, just go to this one ;)