Yes, it's very frustrating whenever I come across a listing which has been listed under "Entire Home" but is actually just a room or portion of the property in question.
Airbnb doesn't really care about these things right now so they haven't implemented any "direct" feature which can deal with this issue. Although they are aware of it. Also, what's been happening is that sometimes it's a matter of perception for a lot of people. In Europe, a lot of people think if a person has his own room and a bathroom, it's an "Entire Home" to themselves. So a lot of people list their properties under "Entire Home" by mistake and unintentionally. And then there are times when guests themselves don't understand the difference and they don't mind sharing the place.
So that's why Airbnb hasn't looked into this proactively. As they say, they have bigger fishes to fry.
A good rule of thumb for every guest should be to ask a question to the host before making a booking. Whenever I book, regardless of the city or the country, the four standard questions I ask to EVERY SINGLE HOST are as below.
1) Is this a stand-alone apartment in some apartment building or is it one of the rooms in someone's house/apartment?
2) What's the speed of the wireless Internet? I will be working online for few hours everyday while there so I just want to make sure that the wireless Internet is of a good speed. This is an extremely important piece of information for me to know. Also, is the router inside the apartment or somewhere else?
3) Since I will be there for (number of nights) nights, will you or someone else be available in case I need any help with regards to the apartment? Do you live nearby or far from the apartment?
4) Would it be possible to know the address of the apartment? I just want to look that up on the maps to see the location, the street, and the distance.
#1 deals with this issue and I think every guest for whom it matters should ask this question. #2 is something extremely important to me personally. #3 tells me whether I will get some help, and how promptly, if at all I need it. #4 kind of helps you figure out #1. There are many cities around the world who have Google street view and based on the address you can look at the actual property in Google maps. Although, it's Airbnb's policy for the Hosts to not provide address before the booking. But for the most part, many of the Hosts provide the address.
Hope it helps!
Thank you!