We had a wonderful stay at Joan's place. Joan is a perfect host. She is friendly and helpfull. Joan waited for us on the bus stop, so we wouldn't have to look for a place at night, she showed us nice places around - where to shop, or eat some breakfast - be sure to go for a Poco Poco cafe - they have good prices and delicious ftiras :). Joan has even walked with us to a bus when we were leaving at 5 AM, so we wouldn't miss the bus, and told the driver to let us know where to switch busses! :)
The place is clean and tidy, there is a lot of space in the room, so it is ok for a week stay. There is also a small fridge, so you will be able to store your food or water.
I will recommend Joan's room for everyone :)
About Birkirkara, you may be happy that this isn't a touristic place and it is like center for every bus in the city, so you can easily travel wherever you want from there!