We've stayed in quite a few apartments in various cities around the world through Airbnb, and I would say that Ricardo's apartment in Chiado is the best place we've ever stayed in. Categorically.
For a start, the location is perfect - right near Largo do Carmo and minutes away from Rossio and Bairro Alto, so it's quiet, but quick to get to interesting places in the evening. Secondly, the apartment is supremely stylish, clean, charming, and has pretty much all the facilities you could ever need. We stayed for a weekend, but could have stayed happily for a week. There's a very well-equipped kitchen and dining area, if you fancy cooking for yourself. The bed is really comfortable and the bright colour scheme is very smile-inducing.
We arrived late after our flight was delayed and Ricardo met us without any complaints and was a perfect, courteous host.
If you're not sure where to stay in Lisbon, please look no further and just book this apartment. I guarantee you won't be disappointed!