Very surprised at how quite spacious it is side opening as well as top I’ve only got one Guineapig and it’s ideal for her only downside is that got to get a smaller sized sleeping quarters as the one I had is a large need a small to medium one quick delivery tooooo quite thick bars not ideal for hamsters or mice rats etc because the gaps in bars are tooo big and they escape I will definitely recommend for a Guineapig or small dwarf rabbits