I stayed a week in Residence Rouge and everything was perfect. It's very well located, less than 10 minutes walking to Valletta and 2 minutes walking to the bus stop where you can take lots of different bus routes.
The apartment is very cozy, with a big kitchen, a private roof and a huge and very comfortable bed. It has also air conditioning in the room, which is a pleasure in such a hot country.
Alan is an excellent host, he helped us at all times and aswered quickly our messages.
Definitely, Residence Rouge is a very good option to stay in Malta. I would highly recommend to everyone.