My girlfriend and i had a great time at Manuels apartment. I texted him, when we arrived at the airport to make sure we meet us in time at the apartment. He showed us everything the apartment has to offer and he told us how to get to the most important places in lisbon. There is a tiny supermarket right around the corner and a big one at the metro station "Rato", which is reachable in 5 minutes by walking.
There are several breakfast options near the apartment, because the park Principe Real is only a few steps from the flat, there are also many possibilities for going out at night and several great restaurants.

The apartment itself was very clean, the kitchen offers everything you need for a nice stay and the rest of the flat is very comfy. The neighbours are very quiet.

I would definitely book again, if i ever come back to lisbon.