We very much enjoyed our stay. Fran's place is nice, clean, airy on a quiet street near the centre of Lisbon.
This place is actually more of a hostel. There are about 4/5 rooms with other random people and 2 shared bathrooms. Therefore cleanliness may actually change depending on the people you are staying with. This can lead to things like toilet paper running out or people leaving their mess around.
Some of the rooms are very big and have lots of light but some are dark and small. We stayed in the green room which was nice.
The whole place is very clean.
Communication with Fran was instant and he was very helpful (I asked for a fan and it was provided the same day!).
Note that the walk from the apartment to the centre is longer than you think and quite hilly (which is to be expected in Lisbon).