The well-equipped Tree Lemon House was a fine, relative calm stay in the heart of Lisbon. (we were hearing the neighbours sometimes very well, but if you want a very calm stay in the heart of a big city then one should book a hotel room ;) Also we have enjoyed the terrace very much which was not so hot as the surroundings (in the beginning of September).
Furthermore Lourenço has adapted the check-in and check-out times for us (early in the morning and late in the afternoon).
If we will return to Lisbon then this flat is our favourite stay.