Rui & Elsa are great, responsive hosts who try to accommodate their guests very well. The apartment is in a great great location and is very well maintained. I would note a couple of things that are not the fault of Rui and Elsa but just to keep in mind:
- the apartment is in the alfama so keep in mind that it can be loud at night
- the apartment is older (which gives it a lot of charm) so it is quite warm in the summer months
- it's not a one bedroom, it is a studio with a divider just in case you are someone who needs a separate room
that being said I would absolutely rent it again in the right circumstance and would absolutely rent a place from rui and elsa.