Туалет means the toilet room, not the toilet itself (which is унита́з). I think they need to change the translation, at least for consistency with other sentences (I think they use 'bathroom' elsewhere?).
Fixed. We stick to AmE for the sake of consistency here, even if it is problematic. For one, in Russian the room with a bathub and the room with a toilet bowl are not called the same, and are different rooms (given that a typical apartment has only one bathtub and one toilet, it is pretty inconvenient to have a joint bathroom, unless only one or two people live in that apartment).
Please don't insist on "bathroom" or "restroom", although they should be acceptable alternatives. These are American euphemisms. In Britain, a bathroom has to contain a bath or a shower, though it might well also contain a toilet. Most British people nowadays will use "toilet" to describe a small room that contains only a toilet and a washbasin, which many houses have, although people who grew up in the fifties and sixties might call this room the "loo" or the "lavatory". In shops or stations, it might be marked as "WC" (an acronym of "water closet", which is never used in current speech) and in bars there might be two doors marked "Ladies" and "Gentlemen". Tourist guides and town plans might mention "public conveniences".
Prepositions can be important: if you were to remark that you lost your pencil "down the toilet" nobody except a plumber would seek to retrieve it.
I apologise for writing at length on this subject, but it always seemed to me a rather crucial one for visitors to other countries.
Typical Soviet flats in standard houses have 1,2, or 3 bedrooms, i.e. the whole flat is a kitchen + N bedrooms + bathroom + toilet + the entrance area and the corridor. Sometimes a balcony.
Sometimes large families do live in these but generally you get something like 2 parents + 2 kids in a 2-bedroom flat. One toilet is usually enough.
If you are really curious, floor plans are easy to find. Late Soviet projects might even have 4-bedroom flats. Expensive flats in modern buildings can be even bigger.
- as far as I know, Soviet buildings never had studio flats. Now we do. However, smaller accommodations definitely existed (for example, dormitories)
Забы́ла is a perfective verb, its infinitive is забы́ть.
The corresponding imperfective is забыва́ть.