First, the good stuff: you will not have a better view of Lisbon anywhere. being on the top floor, there is a terrific panorama from the castle in the East to the Bridge in the West, truly magnificent. Also, Laura is a lovely host; the apartment was clean and well presented (though all the white goods are old and quirky and really need replacing), and the communication beforehand and while we were in Lisbon was excellent.
However, the biggest problem -- and it's a big one -- is the really rude French woman living on the floor below. She came up and spoke reasonably on the first night, as we didn't arrive till after midnight, explaining that she could hear us walking about. Three nights later, she came up ringing the doorbell, speaking extremely rudely, and persisting in her anti-social behaviour even after we had closed the door. This was at 11.05pm, i.e. hardly late. We were a family with three well-behaved kids, not coming home late, not playing loud music, not having the TV blaring, simply unacceptable complaining about us walking about, not turning cartwheels or performing handstands. We reported this to Laura, saying that this was unacceptable, and if it persisted we would have to leave. Laura contacted the woman's landlord, and this appeared to have some success early on, though it was clear to us that she (and her 84 year-old Mother -- you'll get to hear all this yourselves when you meet her!) had left the apartment and gone on holiday. However, the last two nights, she employed a new tactic, namely hammering on her ceiling/our floor. Again, this was not late, and we were not noisy.
Other than that, Lisbon was very good to us. We felt safe everywhere we went, public transport was terrific (and all integrated!), food and drink super (make sure you go to Decadente around the corner, and Descobre in Belem), and it's a terrific city for walking in and getting fit.
So, all in all, please go, Laura's flat is very nice, and would be perfect if it wasn't for her insufferably rude neighbour ...