We stayed at Rui's apartment for 5 days. His father met us and showed us the apartment and how to use the shower, keys etc. Very nice man. The place was easy to find in a quiet side street. The location in Lisbon is great, right in the middle between Belem and the Castle. Easy to get to either and also to Cais do Sodre a 10 minute walk.

Some pros of the apartment-
Location
Great views of the river and city
Comes with Wifi, washing machine, microwave, cooker, coffee machine, TV, city guides etc
Very comfortable double bed (and single beds not used)
Good price
Clean
Secure
Was able to sleep well, no noise from people
Bottle of wine on arrival!!
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The apartment can get a little cold ( late March/early April) but there are radiators that help a bit.
Also there are a lot of steep steps to get to the apartment (5th floor).

Overall enjoyed a great trip and enjoyed staying here and would stay here again.