The best thing about Celso's apartment is the location. It is located in one of the key areas of the city where you can walk to almost all popular attractions / areas in a matter of minutes. It is an apartment with a few rooms and shared bathrooms. I absolutely loved it. Celso's communication and Klaudia's help at check-in was absolutely great. iwas very comfortable every step of the way. I was there last week (May) and hence didnt feel the effects of warm weather as some people have mentioned. The only thing I would mention is the 3 floor stair climb. This could be a problem if you have a bit of a fitness challenge or knee / leg pain etc. It specially seemed cumbersome after doing 2 walking tours during the day :)
The bathrooms are always kept clean and well-equipped with all the requirements. The wifi works very well. Although I did not use the kitchen but again it was well equipped with all the utensils etc. required.
Thank you and whenever I am in Lisbon again, I will definitely stay there.