The flat is fantastic, perfectly sized for two people, well kept and extremely well cleaned.
All the service included (wi-fi, coffee machine, air conditioner) worked perfectly.
The position is very good to reach the center of the town, the metro and the two main train station for reaching either Sintra or Estoril/Cascais. Be aware that to reach the flat it is needed to walk up to tua Calcada Santana which is rather steep.
Communication with the owner was prompt and clear. Generally speaking we did not have anything to complain of. 100% recommended flat.