some measurements:
+ today average room height is 2.45 (buildings like the one shown are probably built 1950-1970...thus their room height might be arround 220-230cm)...older buildings 200-220cm
+ avarage door today 85/205 (older doors 70/190)
+ average window 70/120cm
+ windowsill arround 100-110cm
+ floor/ceiling plate (plus floor structure) are about 30cm-45cm
+ stairs 17/25cm (height/depth)
the scene itself looks ok. but cbabe compared to it doesnt. you might have to rescale her about 30-40% to match the scene
some other points:
+ windows showing into a back alley wont be that big in the first place. they are also usually set higher (140cm)
+ you need a window lintel above them (today 6.5cm older ones used 12cm height and half a bricksize plus in length compared to the window size)
+ dont cut bricks that way. create it as it should work in real life
