As the current prostitution laws stand, bawdy house is still considered illegal; which is where ONE or MORE ladies use the space to ply their trade. However, the Federal Laws have been struck down by the Ontario Supreme Court. They are in current 'stay' for a year so the federal government can amend the laws on a federal level.
In the mean time; it's my understanding due to the up and coming change in the Federal Laws, there is no prosecutor that will convict a lady who is working within her home. *Dont take my word for it*
Bylaws for each municipality will likely not change. So instead of possible federal conviction a lady must still be wary of large bylaw fines.
It is my understanding that renting a hotel to 'work' is a grey line as she does not live there, or answer the phone for her clients to come by. Cell phones are still considered personal therefore it is my understanding that they do not play into use for service, ie: under public solicitation laws.
http://en.wikipedia.org/wiki/Prostitution_in_Canada