3 & 4 Albany House (the units DLRCoCo bought) are the two small units built by subdividing the old coach house of the main Albany House (which itself has been split into two "luxury" units).
3 & 4 are both 2 beds. Per the planning application one is 100sqm while the other is 83sqm.
The houses going for €1mm are all 200sqm+ 3-5 bed houses.
DLR got 2 of 22 units in the development.
The houses look like they've a great finish but the location is terrible IMHO.
Per Blackcrock1's post above, it looks like Albany has been a total disaster for Cairn - only 3 out of 20 private market units are listed on the PPR when the scheme was launched in May 2016 (per the Irish Times). That is a fiasco.