We had a great 2 week stay at Lorenzo's.
The place is in the center of the lower city within walking distance to everything you would ever need - cafés, grocery stores, bars, bakeries and the upper city. The wifi is perfect (used it for work) and the shower is to die for!
However the wall that separates the other guest house (which is also an airbnb) is fairly thin so be mindful of not making too much noise and hopefully your neighbors will do the same. :)
All in all - great value for the price!