We spent three nights in the Mondrian in late February.
Pros: Isabel is a lovely host who answered all of our questions and sent lots of info (and left us a bottle of wine and bottled water). The check-in with the doorman was convenient. Underground parking is connected to the building and easy to access. The location of the unit is wonderful with easy walking to lots of sites, restaurants, public transit close by, and a large grocery store around the corner. Bedding and towels were nice.
Cons: There is no air conditioning in the unit and we found it warm on a sunny 22C day even with the curtains closed all day (the unit gets the afternoon sun). We used the electric fan to try to cool things down. I think it could feel a bit like an oven in the summer.
Other: there’s a drip coffee maker, but no coffee or milk (you can get both at the shop around the corner). The mattress was firm for my liking. This is a studio unit so if you want a sofa don’t stay here (we knew it was small, but felt even smaller than than the photos). There is one dim pot light in the bathroom that didn’t provide enough light (for me) to do my hair or my make-up. Laundry is available on the first floor for 7€ for wash & dry. Also note there’s no shampoo provided.