ryokinwa futsuuno hoteru yorimo zutto yasui.
Ok, basically my guess is that this sentence says something like "There is a relaxed payment plan for the hotel so you can rest all you want", but I don't think it is.
ryo-kin (amount you pay)
futsuu no (ordinary)
hoteru (hotel) you guessed this wright
...yorimo + adjective (-er than ...)
zutto + adjective (much ~)
yasui (cheap)
(Its) charge/cost is much cheaper than ordinary hotels.
I guess it means the cost for a stay at a capsule hotel.
yoru, osokunatte, denshani noru kotoga dekinakunatta sarariimanni, kapuseru hoteruwa totemo benrida.
My guess: At night (I don't know osokunatte) you are not allowed to use the phone, it is very convenient for salarymen. The sentence seems kinda strange to go from one subject into another so I'm guessing theres some connection between not using the phone and salarymen...
yoru (at night)
osokunatte = osokunaru + te form (to become late)
(osoi + naru = osokunaru)
densha ni (on the train)
noru kotoga dekinakunatta = noru + koto ga + dekinai + naru (past)
adjective + naru : to become such a state
verb + koto ga dekiru (be able to ~)
sarariiman ni : for salarymen
When it gets late at night, for the salarymen who are unable to get on a train
kapuseru hoteru wa (calsule hotels)
totemo benrida (very convenient)
calsule hotels are very convenient.
What is "hiroma", ookii hiroma, is that a big type of room since this paper is about hotels?
Yes, hiroma means a big room which can be translated as a hall, or salle.
It is a word consists of adjective "hiroi" (big in space) + "ma" (room).