I was curious how the questions would look from your point of view. They were quite all right form a Bulgarian perspective. Thing is, these are meant to be one-form-fits-all, covering a really wide variety of habitats. Some options would seem weird to one person, but completely natural to another. As for yours - there was a "panel block" option or something for the building material section. And the rest were sort of "you know them if you live in them". i.e. I'd know my home is reinfoced concrete and nextdoor they'll know about trimmer joitsts. As for the year, I don't know. But probably some of your older neghbours would. 
Number of apartments - number of floors times apt.s per floor - what, 18?
Heating - yep, wide variety. But there was no option for "no heating" in mine. It was this, that or "uninhabited". I'm starting to think there's something fishy in the English translation. (there is a "no heating installation", but I thought that's different)
The area - this should be written on some contract somewhere. Or ask the neighbour above or below you. It kinda affects the rent :P
The alternative to cable TV is an antena. Many people still have these. And now I know there's something wrong with the translation, because there's no mention of appliances in the Bulgarian version. It says something like "Things the household has access to". And I don't think it's so much about income, because prices of these things vary greatly", as it is about a country-wide statistic about internet access or something. Or an overall quality of life. 
Are you literate - the majority of the census is conducted by census agents. Following the older model, they ask you these questions and fill out the form themselves. And that is still the only option for the gypsy ghettos and camps. And it's a perfectly valid question there. 

And I got carried away again. Basically there are weird questions, because there are weird circumstances to which they apply.