Nelson's apartment is very small, but good enough for a couple - we had our 4 years old sun, and maybe wasn't the best for it.
The location is great! Easy to go everywhere in Lisbon. Best feature!
The shower area is super small, and that makes a little hard to have a relaxing bath and a dry bathroom.
Super clean and cute.
One thing to have in mind, that got us as a surprise: no cars are allowed to get in the street (just if you are a local or a taxi) - if you have big suitcase, consider spending extra money with taxi. Uber won't get at the doorstep.
Bottomline: perfect for a two vacation in Lisbon. Recommended!