We stayed at Art-Nouveau for 5 nights at the beginning of April and thoroughly enjoyed our stay! The space is huge, well-designed, and sparklingly clean.
We used all 3 bedrooms, and all were comfortable. Only Saturday night was a wee bit boisterous outside, but the double set of windows really block the noise well which is appreciated. There were fans if we got hot, but we did not need them.
The bathrooms: one is attached to the master and is small but has a standard standup shower with a rain shower head, toilet and sink. The other bathroom has a large tub and a handheld shower head which seems to be common in Europe and a great large sink that easily accommodates two people. There is a toilet in its own separate room. Most of us used the master bath shower because it was easiest for us to use.
The kitchen is huge with a table for 4 and extra chairs. We did not use the kitchen to cook, though we did use the washing machine once and set up the drying rack found in the master bedroom in the kitchen. Everything dried quickly.
The living room is large and beautiful with white leather furniture and plenty of room to sit. Great place to sit and plan your day or relax before dinner.
There is an elevator that can fit two people with luggage, but most of the time we used the stairs.
There is a book written by the hosts that provided loads of recommendations and we used a lot of them. The Bakeshop was very good, as were Cafe-Cafe, Mincovna and Pasta Fresca. The book was very helpful.
I cannot overstate how great the location of the apartment is in relation to everything. The Jewish Quarter is 5 minutes one way, the Old Town Square 5 minutes in another, the Powder Tower 5 minutes in yet another. We walked absolutely everywhere from this apartment and easily came back to drop things off and set out again. Would definitely choose again when returning to Prague.