We stayed here for 10 days for a course that was held at the Marriott hotel - a short 20 minute walk away.
Everyone we encountered was really friendly, and our emails were answered very quickly. We had some minor issues with a broken toaster and some lights that needed replacing - all of which were replaced/fixed very quickly.
The apartment can get a little cold in the evenings - there are small heaters in the bedrooms, but these can cause the circuit to overload - it's very easy to reset fuse though!
There is a door man, who very kindly assisted in obtaining a taxi for our journey to the airport..
The location is great. There are two supermarkets a short distance away, and the Metro station is 5 minute walk away. The metro station will get you to the main tourist areas. Please be very careful when travelling though - we had a wallet stolen whilst on the tram near Belem from a pocket we thought was secure - the pick pockets are very devious!