Helena and Pedro (her husband) were great hosts. Pedro offered the service to go pick me up at the airport and he came explaining facts about Lisbon along the way...it was really nice.
The flat is really well organized and comfortable, the only details that may be relevant are that the bathroom is a bit small and the air conditioning was not 100% effective to warm the whole flat.
When I left, Pedro gave some tips about last places to visit...I would definitely stay at their place again!