The studio is as described. in a good location, clean and comfortable.
Everything you need is there.
Most places can be walked to in half an hour. I even walked to the Azulejos museum in one hour, but the metro is also very close and easy to use with a viva vigem card loaded with zapping credit. This will also take you to Sintra or Cascais for a 1.90 euro deduction each way. (for Belem buy a train card for 1.35 each way plus 50 cents).
I stayed 2 weeks and made 3 trips to Sintra, 2 to Belem and 1 to Cascais.
I walked a lot but I think I had perfect weather for walking in February/ March.
There is a Pingo Doce supermarket 3 minutes walk away or a smaller Continente the other direction towards Estrella.