We didn't meet Maria and Mario but Sandra was our hots and was really nice and helped us get a taxi to the airport and waited with us and the appartment is really good. You could not have a better location with restaurants and bars directly outside as it really is right in the centre of Bairro Alto but because it faces the back it is completely quiet and has everything you need, and everything works. The water heater is a bit temperamental and works for one shower and then needs 10 minutes to recover before you can use it again and the fridge is quite loud but these didn't bother us or stop us from sleeping and you can turn off the fridge at night. Its the perfect location for walking to all the sites - the river and Lisbon centre. We would recommend it to all our friends