We were a group of 3 friends on a city break to Lisbon. Ricardo and Diogo's place looked ideal - bang central in the Baixa Chiado district and having all the mod cons desired by City Break holiday makers like us.
Diogo's communications were very helpful and we easily got ourselves from the airport to the Baixa Chiado Metro (subway/underground) station which is less than a five minute walk away. The Metro journey from the airport to Baixa Chiado station is about 40 minutes with one change at Almeda. Trains are very frequent, clean and safe. The Metro, bus and tram system in Lisbon is brilliant, integrated and cheap. Best way of using it is to get the Via Viagem travel card. These cost just 0.5 Euro and you load them with credit which gets taken off every time you validate it by placing against the readers at station platform entrances or on the bus / tram. Buy one from the machines at the Metro station entrance under the airport. The machines give instructions in English and accept credit/debit cards as well as cash in euros.
Diogo was at the apartment to welcome us on our arrival - as he said he would be - and showed us around while explaining the interesting history of the place. The apartment was just as had been described- all very clean and well maintained.
You'll not go hungry being based here as, although there is a kitchen if you want to cook you own food, you don't ever need to as right outside the front door and in the whole of the surrounding (pedestrianised) area there are many dozens of reasonably priced restaurants serving breakfasts,lunch and dinner. No need to worry about street noise as the area is pedestrianised and with the windows closed the noise from below was well suppressed.
All in all this was an ideal place to stay in Lisbon and I'm very happy to recommend it to anyone!