Felipe's apartment is a nice place to stay in Lisbon. It's very well located in the heart of the city (literally everything is at walking distance) but nonetheless extremely quiet at night. You have everything you need (again, at walking distance): public transport, supermarket, restaurants, corner shops, etc. I would recommend this apartment especially if you're looking to experience a typical portuguese lifestyle.
If I was to return to Lisbon (which I hopefullly will), I would not hesitate to rent one of Felipe's lodgings. He is a fantastic host: likable, funny and effective. He will make you feel at home in a heartbeat. Plus, he will happily give you advice and/or call a taxi for you if necessary.