This was our favorite stay in Portugal, and we were only there for one night. The flat is well-equipped, clean, and well set up. Location is minutes away (~5 minutes walking) from LX Factory which is a super trendy block of businesses, cafes, restaurants, and art. I'd actually pick this over Time Out, which we went to after LX. This flat is a tad further out from the main touristy bit but I believe you're much closer to Pastéis de Belém, which is said to have the best Pastel de Nata.
Mandy&Yu have a solid manual with a breakdown on just about everything. We didn't need much but they took it a step further by providing so much information on what to see, how to see, and where to see. Well done, would recommend it.