Is it for out of cage? If you're looking for a good playhouse I had a cardboard castle that was good - used to set it up on top of the bed.
https://www.petplanet.co.uk/product....xoCqCgQAvD_BwE
If you're looking for a house for a syrian inside the cage there are some good options.
This one is good and has a lift-off roof - so you can check inside without having to take the house out - means the nest doesn't fall apart. The flat roof is something to sit on or put things on too.
It says it's for guinea pigs but it's far too small for a guinea pig and a good size for a hamster. Also - no nails.
https://www.amazon.co.uk/Ferplast-Gu...inea+pig+house
If you want a big house for inside a cage, Rodipet have great houses - they're not cheap - average about £15 and postage is about £8 on top.
https://www.rodipet.de/shop/haeuser/...-xxl-5in1.html
https://www.rodipet.de/shop/haeuser/rodipet-granit/
I have this Labyrinth house for our Syrian
https://www.rodipet.de/shop/haeuser/...erracotta.html