We had an amazing time in Lisbon and at Irina & Ricardo's apartment. Although we did not meet them in person, communication was always easy and helpful, check-in and check-out were uncomplicated (their friend Sofia met us and showed us the apartment, early check-in was possible!) and the apartment was great, just as described. It is located right in the Alfama, close to a beautiful miradouro and with an excellent restaurant next door.
We can highly recommend staying at Irina & Ricardo's!