Well, it's not really up to what I think....It would be different if I lived there.
It is whatever it is, for you.
I personally, would never trust a website that takes your $$....EVER.
Incidentally, an apartment building is also considered a public building and it would be very hard to
rid oneself of spirits in an apartment without some sort of protection set up inside your apartment.
Try a salt cleanse and see how that works for you.
Spirits do attach to other sentient beings and apartments are FULL of other people,
this is why it is very difficult to rid just 1 apartment of bad spirits.
Drop salt in the four corners of your living space, it might help. (might...Meaning definite maybe.)
Energy cleaning with salt
Many believe that salt is an excellent neutraliser of bad energies, bad spells and a purifier of the environment and space. Those who believe in is spiritual properties feel that it can break the tension and evil that may weigh on your house and on your person, not to mention that it is easy to get and easy to use.
SOURCE:
Energy Cleansing Rituals To Do in Your Home.