Me and the girlfriend had a fantastic week in Lisbon staying at Rodrigo's apartment. It's a real home from home, very well equipped and comfortable, and a great place to relax following a hard day touring the city.
Located near the river, approximately half way between Belem and Lisbon city centre, it's a good base for exploring both areas using public transport - trams and buses can be picked up at the bottom of the road regularly, and you'll be in the centre of the action within about 10mins. We ate out a couple of times in restaurants at LX Factory, which is only a short walk away, and can definitely recommend the experience if you don't want to cook.
Finally Rodrigo was a great host - extremely helpful and kind - and I'm looking forward to staying at his place again the next time I'm in Lisbon.