You might try Network Stumbler -- free from sites like FileHippo, CNET, MajorGeeks
If landlord will let you I suggest you try some of the following:
1) raise the router above furniture level
2) Experiment with channels (some will work better or worse depending on your environment)
3) If you can detect strong neighbouring wifi, use a channel that is 5 stops away from strongest.
4) Relocate cordless phone base or video sender etc.