I spent two months in Lisbon for working as a guest PhD student at Instituto Superior Técnico.
I can really recommend to stay at Francescos appartment, especially when you stay for a longer time in Lisbon and like to have a safe haven some time within the exciting city.
Before I arrived I got some very important information from Francesco and I could always contact him to ask some questions.
The check-in was really good, I was welcomed by Maria who showed me the most important places and helped me to request a "Lisboa Viva" card for public transport. She also showed me where I can find the bus stop for coming to Instituto Superior Técnico.
The appartment is located in a quiet region close to Alfama and Gràca, so that you have a good starting point for exploring the city.
The time during my stay as well as the check-out were convenient.