We were lucky enough to stay in Rafael's apartment for 5 nights in July. It is perfectly located within walking distance of two metro lines and there is a supermarket just around the corner too. It was lovely to have use of the pool (what a view!) after a long day of site seeing to rest those achy muscles.
Rafael was very welcoming and helpful and we would definitely recommend his apartment. Lisbon is a wonderful city which I hope to visit again soon!