I can't recommend Emil's place enough for young travelers looking to explore Lisbon. The location couldn't be more ideal: right in the middle of Mouraria, 2 minutes to the metro, 10 minutes by foot to Rossio, maybe twenty minutes tops to Bairro Alto. His apartment is brightly, beautifully painted and decorated with stunning views from the balconies. Impeccably clean. Emil is super kind, very friendly, and gave me a wealth of advice that really made my stay memorable - for instance, where the best beaches are and some great bar and restaurant ideas.
I would only caution travelers that have a hard time with stairs-- from the direction of the metro stop, to get to his apartment you need to first climb maybe forty steps, and then his place is on the top floor, with no elevator. For those with hardy thighs and strong lungs, though, it is an atmospheric, cozy place to call home. I wouldn't hesitate in the slightest to book again!