Ricardo's flat was absolutely perfect for our group of 5. The location is the best part- it's super close to the metro and extremely central, with loads to do in surrounding Alfama. The price made it great value for money, and Ricardo's colleague was extremely helpful and responded quickly whenever we contacted him. Our hot water stopped when the boiler light went out, and he came over and fixed it within half an hour!
The downside of being in such a central neighbourhood is that it's extremely noisy outside at night- there's a (very good) pub downstairs, and church bells ring early in the morning. If you close the windows and shutters you'll be okay, but in the summer that could be sweltering, even with the provided fans. Also, the third bedroom with a single bed can only be reached by going through the second bedroom with two single beds, so make sure those guests are happy coordinating their sleep!