A six unit building with seven parking spaces with everyone home plus your vehicle could mean a visitor may not find street parking and the only thing they may remember is "the place we had to double parked".I have done the open house style with a twist. 

In other words, they are not just here to visit or vacation.

Extended stay would be something like corporate visitors looking for a short term rental.Yes, we'd like to break even, get to use it a little each year hopefully, and one day retire to that property.

Get out of here, you don't want to live here" (I removed all the NSFW words from his comment).After that experience I decided that this street is not suitable for my investment goals.

Exception being when a residential real estate agent {accidentally} catches a small - medium multiunit and,  not having a suitable network of buyers, does what they know and lists it on MLS.You will be better served finding a driven and connected commercial broker in your areas of interest and get yourself on their call list.

I would like to know what's the price range that's suitable for this type of home staging. 

Yes, almost every buyer has things they want to do to make a house more suitable for them; but most don't want huge undertakings.

All that money from visitor spending and taxes will just dry up and blow away. 

If you establish a window of time in which you will be accepting applications, clearly communicate your process and your rental criteria from the start, it's perfectly acceptable to review a batch of applications at the same time, rank them according to your criteria and them process them one at a time until you find a suitable tenant.

Big banks also don't have as wide of a range of loan products available, so it's common that they don't have suitable products for self-employed borrowers.So back to your question, better ideas on financing options....