It was great! Miguel gave us a warm welcome and - even though we arrived shortly before midnight - took plenty of time to show us the apartment and to provide us with tips about what to do in and around Lisboa.
We stayed for six nights and did not miss anything, the apartment has really everything you could ask for: bedroom, bathroom + fully equipped kitchen, it is very clean and in a really nice location close to the city center.
I would always go back there and can highly recommend it!

Markus