I can share some experience of my own. I lived there from the 1950s to the 1990s.
Salaries (in roubles) slowly increased. In the 70s a worker without special qualification could make about 100 roubles/month. Workers with high qualifications were payed more. An average teacher/doctor made 100-200.
My starting salary as a researcher in the early 80s was 130, then it grew (with my rank and qualification) to 200+ in the end of the 80s. A full university professor made 400-500 and this was one of the highest salaries.
Most people rented apartments from the state, at a moderate price (the main problem was availability, not the cost). The price of a 3-room apartment grew from about 10 roubles in 1970s to 20 roubles per month in 1980s. It was possible to rent privately but this was expensive and few people could afford this.
To rent an apartment from the state one had to a) qualify, that is to prove that you had less than 7-9 square meters per person, this norm depended on the city, and b) once you qualified, you were registered, and waited in line, sometimes for 10 years, sometimes more. Factories and other institutions had dormitories, with shared rooms, sometimes small separate rooms and common, shared kitchens and bathrooms. I know some people who lived all their life in these dormitories.
The result was that grown up children frequently lived with their parents and grandparents.
Most of the salary of most people was spent on food. Public transportation was cheap (3-5 copecks, 1 rouble is 100 copecks). A good new TV could cost 300 roubles, and a car several thousand. Nevertheless there was a huge shortage of cars. One could stay in line for many years.
Important notice: medicine and education (on all levels) were free. Moreover, students with good grades were paid a stipend.
All people who worked for the state a sufficient number of years
(more than 10 if I remember correctly) qualified for retirement at a certain age, paid by the State. The State also paid for disability benefits.
Of course I do not mention income from illegal business which grew quite a lot, especially in the 80s. For example, US-made jeans was a common item of illegal trade in the 1980th. You could pay 100 roubles for a pair of genuine Levy Strauss or Wrangler, average monthly salary!