Reply:
Portable air conditioners are useful if you want to cool a single room. They also come in handy if you are a tenant living in an apartment with no A/C.
Capacity is limited so the room would have to be small, don’t expect it to cool very much area and keep the room closed to improved performance.
They usually require you to have either a window open in such a way that a small hose or duct has access to the outside air for heat rejection — or — they require a doorway so part of the equipment can expel the heat.
One other type is a split system with flexible hose pipes between two parts of equipment, same situation here requiring outside access.
Portable A/C fill a gap in the market for flexible small capacity machines. They tend to be expensive when you see what you get (capacity) but for sheer flexibility they are ok.
Recommend DeLonghi if you have them where you live.

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Question: 

The air conditioner guy tells me that’s the brand he uses. I’ve never heard of them. Does anyone have any advice for me?

Reply:

Yes I know of them. I am not quite sure what you are asking but to hazard a guess I would say you are wondering if they are any good.
Not the best unit around at all, they are cheap and that’s all I can say about them.
For a reliable unit / brand try the following:
Daikin
Mitsubishi Electric
Carrier
There are many many more but the first 2 are who I recommend especially Daikin, for reliability.