We found staying at Michelle's flat very useful and easy. It is very clean and tidy and has everything you might need. Fridge, kettle, coffee machine, washing machine, iron. There is a cooker and TV but we didn't use them.
Michelle and her mother were very kind and helpful.
It is a ground floor flat on a fairly main street with the 729 bus and 15E tram stop almost right outside the door. There are two entrances. We used the door direct onto the street.
You can go straight to the centre of Lisbon by the tram. You can also get Uber to pick you up outside and taxis are not far away. You can get several buses in Belem. We found 728 most useful.
The flat is easy walking distance to everything in Belem including the Tower of Belem (10 minutes, across a bridge) and the Champalimaud Foundation conference centre by the river. (15 minutes). Once on the river side you can walk, run or cycle for miles towards the centre of Lisbon.
Shops including a small supermarket are a short walk away (less than 10 minutes) and the famous Mosterio Jeronimos and many restaurants, museums and parks just a bit further in Belem.