I have to comment. That's huge! Way bigger than most UK Victorian 2 up, 2 down terraces. More like the size expected in an older 4 bedroom house if you ignore the extra space the photographer is clearly standing in.
That's slightly smaller than ours probably all in all. But I've seen smaller, like the one up, one down back to backs in Leeds/Woodhouse and many modern flats apartments, are just broom cupboards - but then you look at down town Japan and this feels palacial.
Have a random right move link of what I think as typical Victorian worker's terrace: https://www.rightmove.co.uk/property-for-sale/property-62228...
The door by the yellow chair is a tiny porch with front door beyond. No idea how it compares with OP's.