My three friends and I stayed in Lisbon for four days and the apartment comfortably slept all four of us between the two single beds and shared sofa bed. The kitchen came with a little pack with some olive oil and soap for making and cleaning up meals and the nespresso machine was a nice addition.
The apartment was clean, tidy and well located for our few days in the city. The check-in was a little bit of faf - you have to collect the key from a different part of town - but not reason enough to put you off.
Would recommend.