This is a lovely place! Our apartment was one of a small cluster of apartments on the same floor of the building. The apartment was really nicely decorated and had beautiful views over the Tagus. We were also met in person by Francisco who gave us a personal tour of the apartment and all the equipment we could use (including a fruit juicer, which they gave us free oranges for!). No need to worry about researching restaurants or activities: comprehensive lists of recommendations are provided! We really appreciated this warm welcome - we were taken aback by the kindness and generosity of all the Portuguese people we interacted with during our trip, and the guys who run this Airbnb are no exception.
The location of the apartment is fantastic - you are right in Chiado and steps from the Carmo Convent.
There is only one warning I will give to light sleepers: there was quite loud music and noise from the nearby square during our stay. This made it quite hard to sleep at night, even with the windows shut. I think this was probably because we were staying on a Friday and Saturday night, perhaps it's quieter during the week. But this was obviously outside the control of our hosts, who provided a wonderful apartment and welcome. Muito obrigado!