Corporate client in a residential property?

[Kay March]

It seems like every time I advertise a house for rent, I get an inquiry from someone representing a client who is seeking to use it as a furnished short-term or corporate rental. They want it for 12-24 months with an option to renew and are willing to pay $100 additional rent. The person inquiring gives only her first name and last name's initial, she does not tell what company she works for or who the "client" is, and if I Google her first name and phone number nothing comes up. The proposal is unattractive to me not only because I know nothing about this sort of thing but also because I like to have a direct contractual relationship with the tenant. Is anyone familiar with this type of situation. Is it legit?