We had a very pleasant and awesome time at Tomas'. And we'd highly recommend it if you visit Lisbon for a short or long stay!
All the areas inside of the place/studio were sparkling clean. The kitchen, even though it was relatively small, it was well equipped.
The place is a little far from the city center, but by bus it can be reached at no time. If you like to walk around, the distance is also doable (that's what we mostly did). Like in many areas of Lisbon, you can hear all the planes flying to or from the Lisbon airport. Which may be a problem for some people during the night. There is also a nice local backery around the corner, which comes very useful.
Tomás was extremely friendly and responsive to all of our concerns. He was glad and ready to host us even though we booked at a very short notice.