Because of the location I decided to cancel my reservation at the Radisson Blu and stay at Miguel's.
This place is amazing! Cold and quiet air conditioner unit, located in the middle of Baixa-Chiado, close to many restaurants and walking distance to Alfama and all the important sites. Only 12 euros from the airport. The breakfast was the best! Miguel was a great host, he gave me all the important tips that only locals know and left me a map with many ideas for the weekend. I would highly recommend staying here!