Just stay here. The apartment is great with views of the river, full of light and parking in the street outside if you are driving through Portugal as we were. You can then use the brilliant bus, tram (and super cheap Uber) system to get into the centre - though Belém has great attractions itself. Ana was a terrific host, very thoughtful and informative. We loved all her recommendations but if you want to splash out for Portuguese cooking with a twist - the restaurant on the corner is terrific.